chapter one
Basic knowledge of ethanol gasoline for vehicles
1. What is ethanol gasoline for vehicles?
Automobile ethanol gasoline is made by adding a certain volume ratio (currently tentatively 10% in China) of denatured fuel ethanol into special gasoline component oil without MTBE oxygen additive by a specified automobile ethanol gasoline blending center according to the quality requirements of national standard GB1-2001.
2. What is denatured fuel ethanol?
Ethanol, commonly known as alcohol, denatured fuel ethanol is anhydrous ethanol with a content of 99.2% produced by special equipment and special dehydration process according to the national standard GB 18350-200 1. After denaturation, it is not allowed to eat fuel ethanol that is only used to prepare ethanol gasoline for vehicles.
Three, there are several kinds of automobile ethanol gasoline labels, how to label?
According to the research octane number, ethanol gasoline for vehicles is divided into three grades: 90, 93 and 95. The marking method is to add the letter E in front of the gasoline label as the unified marking of ethanol gasoline for vehicles. The logos of the three brands of gasoline are "E90 ethanol gasoline No.90", "E90 ethanol gasoline No.93" and "E90 ethanol gasoline No.95" respectively.
4. What are the applicable models and types of ethanol gasoline for vehicles?
Ethanol gasoline for vehicles is suitable for all kinds of vehicles with ignition engines, large, medium and small carburetors or vehicles with EFI fuel supply.
V. Advantages of ethanol gasoline for vehicles
1. Improve fuel quality: Ethanol in ethanol gasoline for vehicles is not only an energy source, but also an excellent gasoline quality improver. First of all, as a "green" oxygenator, ethanol can completely replace the use of MTBE, an oxygen-containing additive in gasoline. Due to the serious harm of MTBE to groundwater resources, some developed countries have legislated to prohibit its use. When ethanol is mixed into gasoline at the ratio of 10%, the oxygen content can reach 3.5%, and the combustion-supporting effect is good, so that the unburned part of gasoline can be fully burned and the combustion calorific value of gasoline can be improved. In addition, the RON index in ethanol can reach11unit, and the octane number can be increased by 2-3 units when ethanol is mixed into gasoline at the ratio of 10%, thus improving the antiknock performance of oil products.
2. Reduce harmful exhaust emissions: The emission of harmful automobile exhaust, especially in areas and cities with high population density and large traffic volume, has become a serious environmental pollution source. Automobile ethanol gasoline can reduce the total emission of harmful automobile exhaust by more than 33% due to full combustion. According to the 80,000-kilometer driving test data of vehicle ethanol gasoline made by China Automobile Research Center in 200 1 year, the CO emission in the exhaust gas is obviously reduced, the maximum reduction rate is 55%, the arithmetic average reduction rate is 30.8%, and the arithmetic average reduction rate of HC compounds is 13.4%.
3. Full combustion, reducing carbon deposition: Due to complete combustion, the automobile ethanol gasoline solves the phenomenon of carbon particle accumulation caused by incomplete combustion of ordinary gasoline, which can effectively prevent and eliminate carbon deposition in the engine combustion chamber, valve, spark plug, exhaust pipe and muffler, avoid the failure caused by carbon deposition, ensure the engine to work at the designed working point, and prolong the service life of the engine.
4. Self-cleaning of fuel system: The ethanol added in ethanol gasoline for vehicles is an excellent organic solvent. It has good cleaning effect, can effectively eliminate the precipitation and condensation of fuel impurities (especially colloid phenomenon) in automobile fuel tank and oil system, and has good oil channel dredging effect.
chapter two
First, whether the automobile engine needs to be modified to use ethanol gasoline for vehicles.
According to the driving test results of three 80,000-kilometer vehicles in April, 20001year by China Automotive Technology and Research Center, it is shown that 65,438+00% ethanol gasoline can be used normally without changing the engine. This point has also been confirmed in the pilot projects in Zhengzhou, Luoyang and Nanyang.
Second, some characteristics that should be paid attention to in the use of ethanol gasoline for vehicles
1, self-cleaning characteristics
Ethanol in vehicle ethanol gasoline is an excellent organic solvent with strong dissolution and cleaning characteristics. Experienced drivers and maintenance personnel often clean carburetors with ethanol. The carburetor cleaned in this way is clean and thorough. Similarly, ethanol gasoline for vehicles can also clean the oil circuit and keep the oil circuit unblocked. However, when the vehicle uses ethanol gasoline for the first time, especially after using 1-2 fuel tank oil, under the cleaning effect of ethanol gasoline, various impurities will be deposited and accumulated in the fuel tank and oil circuit (the longer the time, the more impurities will be accumulated. Especially iron oil tanks), such as rust, dirt, colloidal particles, etc. It is softened, dissolved and mixed into oil. These impurities may cause poor oil flow.
Suggestion: When the vehicle uses ethanol gasoline for the first time, it is best to clean the main components of the vehicle fuel tank and oil circuit, such as fuel filter and carburetor. Ensure the cleanliness of all components of the fuel system.
2, hydrophilic characteristics
Vehicle ethanol gasoline is mixed with a certain amount of denatured fuel ethanol, which is a hydrophilic liquid and easily miscible with water. Unlike gasoline, gasoline can be separated from water, and water is deposited at the bottom of the fuel tank. Therefore, when the vehicle uses ethanol gasoline for the first time, it should check the fuel tank to prevent ethanol gasoline from dissolving with the precipitation water that may exist at the bottom of the fuel tank, so that the water in the engine oil exceeds the standard and affects the normal operation of the engine.
Suggestion: Although this situation is rare, it cannot be ignored.
3. Is ethanol gasoline corrosive to metals?
The test shows that no obvious corrosion phenomenon is found in the corrosion test of brass, cast iron, steel, zinc and aluminum after adding metal corrosion inhibitor to ethanol gasoline. So far, no corrosion damage of metal parts has been found in the pilot vehicles.
4. Does ethanol gasoline have an effect on rubber adaptability?
The test shows that most rubber parts can adapt to ethanol gasoline. Only a few kinds are not suitable, but the corrosion is slow. In the pilot project, it was found that the rubber diaphragm in the early mechanical gasoline pump had poor adaptability, and some cracks appeared after using ethanol gasoline. Because the rubber parts can't distinguish the material composition in appearance, the purchased parts can be soaked in ethanol gasoline for vehicles in advance by the designated garage, and then loaded for use.
3. What preparations do vehicles need to make when using ethanol gasoline for the first time?
1. It is recommended to clean and inspect the oil tank and oil circuit components.
Because automobile ethanol gasoline has strong solubility and cleaning characteristics and hydrophilic characteristics. Therefore, it is suggested that when vehicles use ethanol gasoline for the first time, it is best to carry out a preventive inspection or cleaning of all components of the fuel tank and oil system to ensure the cleanliness of the fuel system.
Vehicles that drivers can't clean by themselves are recommended to go to the designated garage for inspection or cleaning.
Vehicles equipped with a clean oil system may not be able to be cleaned.
2, tank oil cleaning project
(1) carburetor vehicle:
Fuel tank-fuel filter-fuel pump-carburetor-oil circuit and oil circuit filter.
② EFI vehicles:
Oil tank-electronic oil pump-fuel filter-nozzle-oil circuit and oil circuit filter screen
3. Cleaning method
① Cleaning of fuel tank
Turn off the vehicle power supply, disconnect the fuel sensor wiring, and remove the fuel sensor or electronic fuel pump.
A, use a hose to pump out the fuel in the fuel tank, leaving fuel about 10- 15cm deep, and wipe the fuel tank with a clean rag.
B, for the oil tank with grille, or the iron oil tank with more deposits, the gas purging method can be adopted, and an external air pump can be connected with a hose, and the gas pressure of 3Kg can be used for purging, so that all kinds of impurities accumulated at the bottom of the oil tank can be cleaned by agitated gasoline.
C, use the disassembly-free cleaning machine to circularly filter and clean the oil tank. Refer to the disassembly-free cleaning instructions for specific operation methods.
② Cleaning of carburetor
Clean with special cleaning agent for carburetor. Clean the outside first, and then disassemble it to clean the inside.
Main cleaning parts: oil level chamber, oil circuits of various departments, main metering holes, atomizing nozzles, etc.
③ Cleaning of fuel pump
A. Electronic fuel pump: clean it with special cleaning agent for carburetor.
Main cleaning parts: oil inlet screen and external impurities.
B. Detachable mechanical fuel pump: clean it with special cleaning agent for carburetor.
Main cleaning components: oil cup, inlet and outlet valves (replace oil pump diaphragm appropriately).
C. Do not disassemble the mechanical fuel pump, and replace it with a new pump as appropriate (mainly the aging of the pump membrane).
4. Cleaning of fuel filter
A, removable fuel filter, clean with clean fuel.
Main cleaning components: oil cup and filter element.
Suggestion: Replace the microporous plastic filter element with nylon cloth net or ceramic filter element (such as Dongfeng EQ 1092 series) as appropriate.
B. Disposable fuel filter
It is recommended to replace.
5, electric nozzle cleaning
Cleaning should be carried out on a special cleaning table. Use special cleaning agent or carbon remover. After cleaning, check the quality of fuel injection, and then reassemble.
6. Debugging inspection
After cleaning, add ethanol gasoline to start the vehicle, check all parts of the fuel system, and eliminate oil leakage when cleaning and installing. At the same time, check and adjust the performance of each part.
7. Adaptive adjustment of vehicles
Compared with ordinary gasoline, the performance of automotive ethanol gasoline is basically the same. Here only from a theoretical point of view to explain. So as to serve as a reference in actual adjustment.
① The theoretical air-fuel ratio of ordinary gasoline is15:1(14.3-15.1), the theoretical air-fuel ratio of ethanol is 9:1,and 10% ethanol is added to ethanol gasoline for vehicles. Theoretically, the air-fuel ratio is 10%. Therefore, the air-fuel ratio should be enriched and adjusted when using ethanol gasoline for vehicles.
(2) Because the burning speed of ethanol contained in ethanol gasoline for vehicles lags behind that of gasoline in theory, when using ethanol gasoline for vehicles, the ignition timing of vehicles with distributor should be adjusted slightly in advance on the basis of timing.
When the EFI vehicle uses ethanol gasoline, the parameters of the engine under various working conditions are automatically controlled by the computer and can be used normally without any adjustment.
Four. Comparison of power and fuel consumption between ethanol gasoline and ordinary gasoline for vehicles.
In terms of mechanism, adding 10% ethanol to ethanol gasoline for vehicles will reduce the dynamic performance. However, due to the rich oxygen content in ethanol, the oxygen content of oil products reaches 3.5%, and the combustion-supporting effect is good, which can fully burn the unburned part of ordinary gasoline and increase the calorific value effect. The two balance each other, so that the power remains unchanged and the comprehensive fuel consumption is flat.
According to 12 vehicles of three types (Li Xia, Fukang and Santana) in February, 20001year, each vehicle travels 80,000 kilometers. The adaptive driving test of ethanol gasoline and ordinary gasoline shows that:
① Compared with the acceleration time from 40km/h to 120km/h, no obvious regularity was found in dynamic performance. Ordinary gasoline and ethanol gasoline have their own advantages and disadvantages, that is, the advantages and disadvantages of the two fuels cannot be distinguished from the acceleration of the whole vehicle.
② The fuel economy of ethanol gasoline is generally better than that of ordinary gasoline, and the fuel consumption of only 1 vehicle is higher than that of ordinary gasoline in the test.
According to the introduction of the Technical Advisory Service Corps of the Office of the Leading Group for the Pilot Work of Ethanol Gasoline for Vehicles in Henan Province, Zhengzhou City, in August 2002, four vehicles (Li Xia, Fukang, Jetta and Songhua River Mini) of 16 carried out a comparative driving test between ethanol gasoline for vehicles and ordinary gasoline in high temperature weather in summer, with the participation of reporters from Henan TV Station, Henan Radio Station, Dahe Daily and Zhengzhou Evening News. The test results show that:
① Compared with ordinary gasoline, automotive ethanol gasoline has good power performance. Neither the driver nor the on-board reporter can tell the difference between the two fuels.
② In the fuel consumption record of 16 vehicles, the fuel consumption of ethanol gasoline of 14 vehicles is lower than that of ordinary gasoline, and only two vehicles have slightly higher fuel consumption than ordinary gasoline.
Chapter III Matters needing attention in using ethanol gasoline for the first time
First, the causes of unstable fuel consumption and matters needing attention
1, vehicle fuel tank and oil system are dirty. At the initial stage, it is mainly reflected that after the 1-2 fuel tank is used up, all kinds of impurities deposited or attached in the fuel tank are softened and dissolved and mixed into the oil, which leads to the blockage of related components of the oil system.
Troubleshooting: clean the oil tank and oil circuit.
2. When refueling for the first time, the precipitated water in the fuel tank was not removed, the water in the fuel tank was dissolved by ethanol gasoline after refueling, or the water in the oil itself exceeded the standard (caused by the gas station not completely removing the precipitated water in the fuel tank), which was caused by abnormal fuel combustion.
Troubleshooting: Drain the fuel in the fuel tank and refill the qualified fuel.
3. When ethanol gasoline was added for the first time, there was no self-adaptive enrichment adjustment of carburetor combustible mixture, and the ignition time was not adjusted in advance. Because the mixture is thin, the ignition time is late.
Elimination method: Adjust carburetor and ignition timing adaptively.
Second, the dynamic performance is affected by the reasons and matters needing attention
1. The oil tank and oil circuit are dirty and the oil circuit is blocked.
Elimination method: refer to the question 10.
2. There is too much water in the oil, resulting in poor combustion.
Elimination method: refer to the question 10.
3. The adjustment of carburetor and ignition timing is not suitable, resulting in too thin mixture and delayed ignition.
Elimination method: refer to the question 10.
Third, measures to prevent oil and gas resistance in summer
Summer weather is hot, fuel oil is affected by high temperature, and some light distillate oil changes from liquid to gas. At this time, the overpressure gas is discharged into the atmosphere through the steam valve on the tank cover. Considering the safety and environmental protection of recently produced vehicles, the valve is designed outside the fuel tank and connected by pipes. Overpressure gas is discharged into carbon canister through pipeline and one-way valve, and is inhaled by engine. If the steam valve is blocked or doesn't work, overpressure gas will enter the oil supply pipeline, which will easily cause gas blockage in the oil circuit.
Troubleshooting: check the working condition of the oil tank accessory-steam pressure valve, and dredge it for maintenance or replacement if necessary.
Four. Causes and solutions of some temporary problems in the initial use of fuel pump
1, mechanical fuel pump:
The main reason is that the material of the oil pump diaphragm is unsuitable or aging. After using ethanol gasoline, the oil pump diaphragm expands and cracks, which makes the oil pump lose its oil pumping function.
Troubleshooting: Replace the oil pump diaphragm. If you can't tell whether the new diaphragm is alcohol-resistant, you can carry out immersion test in advance.
2. Electronic fuel pump
The main reasons are:
① The fuel in the fuel tank is not clean, and the oil inlet of the oil pump is blocked by impurities, resulting in oil cut-off. After the oil inlet is blocked, the oil pump will not be lubricated at high speed for a long time, which will cause the lateral clearance of the oil pump gear to wear out of the standard quickly, and at the same time, it is easy to burn out the oil pump coil and damage the oil pump at high speed.
Troubleshooting: Keep the fuel clean. When the noise of the fuel pump increases, it is generally caused by the blockage of the oil inlet screen and poor oil inlet. Clean the oil pump filter screen in time.
(2) If the fuel sensor or sensor float is damaged due to improper materials, the accuracy of oil level sensing will be affected, and the oil can not be replenished in time, so that the idle speed of the oil pump is lower than the oil level safety line or in an oil-free state, which is also the reason for the early damage or burning of the oil pump.
Troubleshooting: Check the working condition of the fuel sensor, and repair or replace it with a new one in time if it is damaged.
Chapter IV Basic Operation and Precautions of Using Ethanol Gasoline at the Initial Stage of Motorcycle
First, preparation before use
1. It is recommended that the motorcycle fuel tank be cleaned and inspected when it is used for the first time. Especially for motorcycles with a long service life, its iron fuel tank is easy to rust during long-term use, and there are more rubber particles attached. Therefore, the motorcycle fuel tank should be checked for preventive cleaning. Clean the oil tank properly if necessary.
Experience has proved that when using ethanol gasoline in the early stage, the common oil circuit problems (mainly carburetor and fuel filter blocked by dirt) are related to the unclean fuel tank.
2. Cleaning of fuel tank
When cleaning, you can clean the vehicle or remove the fuel tank according to the situation. Cleaning operation can refer to the cleaning operation method of automobile fuel tank.
3. Cleaning of carburetor and fuel filter
Cleaning method: according to the conventional cleaning method of carburetor and fuel filter.
4. Newly bought motorcycles or motorcycles that have been used for less than one year can be added with ethanol gasoline without cleaning because the fuel tank oil circuit is relatively clean.
Second, the necessary measures
1. It is suggested that for motorcycles without fuel filters, disposable filters can be installed in the oil circuit between the fuel tank and carburetor to ensure the cleanliness of fuel.
2. Because the air-fuel ratio of ethanol gasoline is required to be richer than that of ordinary gasoline, the best mixing ratio of carburetor should be adjusted to improve the power performance and fuel economy of the engine.
Third, matters needing attention
1. When starting a motorcycle for the first time in winter, it is best to preheat the motorcycle with a small throttle (about one minute) before starting. In order to improve the atomization effect characteristics of oil products, the engine has the best output power and the best economic fuel consumption.
2. Pay attention to the cleanliness of motorcycle fuel when using it for the first time.
Chapter V Matters needing attention and operation methods of using ethanol gasoline in winter and summer
I. Precautions and operation methods for using ethanol gasoline in winter
Warm-up Start: Due to the atomization and combustion characteristics of ethanol gasoline, when starting the vehicle for the first time every day in winter, it should be fully warmed up (about 1-2 minutes), and then start driving after the engine temperature rises.
Two, the use of ethanol gasoline in summer matters needing attention and operation methods
1. Check whether the intake and exhaust valves of the fuel tank are unblocked: the high ambient temperature in summer increases the volatility of fuel. For example, the exhaust valve, an accessory of the fuel tank, is blocked. When part of the fuel is converted from liquid to gas, the gas cannot be discharged through the exhaust valve, which easily leads to an increase in the probability of gas resistance in the oil circuit (as does ordinary gasoline).
2. For vehicles using ethanol gasoline, don't fill the fuel tank too full when refueling in summer, and leave some room for oil expansion.
3. If you go to a place where there is no ethanol gasoline, ethanol gasoline and ordinary gasoline can be mixed at will.
The sixth chapter introduces the pilot example of ethanol gasoline for vehicles.
First, an example analysis of high gas resistance and fuel consumption in oil circuit in summer
1, date: July 2002
Venue: Zhengzhou City
Owner: XX automobile special service station
Model: Li Xia sedan.
2. Owner's response: After adding ethanol gasoline, the fuel Louis has gas resistance, and the fuel consumption increases by about 3 liters/100 kilometers.
3. Implementation: In order to implement the situation reflected by the owner, find out the cause of the problem and solve the problem, the original condition of the car was tested after consultation with the owner. On July 30th, the company sent drivers to drive along the North Ring Road, West Ring Road and Zhongyuan Road170km. Three gas resistance flameout failures occurred during driving. In order to accurately measure the fuel consumption of a car for 100 kilometers, the fuel tank is removed and dumped, and the fuel is measured with a cup. The mileage is 52 kilometers, the speed is 70-80 kilometers per hour, and the driving route is the North Ring Road-Yellow River Tourist Area, and the fuel consumption is 5.64 liters, 100 kilometers 10.8 liters. Although there is no air resistance during driving, there is an increase in fuel consumption.
4. Cause analysis: After checking the vehicle, two problems were found: ① The exhaust valve of the fuel tank was blocked. ② The supply of engine oil exceeds demand. In order to solve the problem of air resistance, the owner connected an electric fuel pump in series in the fuel pipeline.
5. Solution: ① dredge the exhaust valve of the fuel tank; ② Dismantle the series electric oil pump and replace the ablated distributor platinum; ③ Clean the carburetor and adjust the ignition time and combustible mixture.
6. Road test results: After the vehicle is checked and adjusted, it will be driven by the unit driver, and the road test will be carried out along the sections such as the North Ring Road and the Yellow River tourist area. The road test adopts two-cycle comparison, that is, measuring ordinary gasoline and ethanol gasoline for one cycle each 100 km. In contrast, the car air conditioner was turned on during the whole driving process, the ambient temperature was 36℃, the speed was 70-80 km/h, and there was no gas resistance flameout in the car. Compared with ordinary gasoline, the fuel consumption is 9 liters/100 kilometers, and ethanol gasoline is 7.8 liters/100 kilometers. There is no difference in dynamic performance. On August 3rd, 65438+ was organized by the Provincial Pilot Office, and media reporters such as Henan TV Station, Henan Radio Station, Dahe Daily and Zhengzhou Daily participated in the comparative test of the two fuels, tracking, recording and supervising the whole process. After adjusting the fuel and circuit system again, the fuel consumption of ethanol gasoline is 6.5 liters per 100 kilometers with the air conditioner on all the time. Even the on-board reporter can't tell the difference between the two kinds of fuel power.
Second, an example of oil blockage caused by unclean fuel.
1, date: June 2002
Venue: Zhengzhou City
Owner: XX car rental company
Model: Fukang automobile
2. At noon on June 17, the taxi stalled because it didn't supply oil, and the owner thought that adding ethanol gasoline caused gas resistance in the oil circuit. While complaining, the owner checked the oil circuit in the scorching sun, sweating like a pig. At that time, the scene was just seen by the staff of the Technical Consulting Service Corps of the Provincial Pilot Office passing by here, that is, they took the initiative to ask and do it themselves to help the driver analyze and check the cause of the oil circuit failure. During the inspection, it was found that the oil pipeline between the oil tank and the filter was blocked. After the blockage in the oil pipe is removed, the oil pipe is unblocked and the vehicle starts.
3. Cause analysis: Because the blockage in the fuel pipe of this vehicle is the impurity in the fuel tank, it is considered that the fuel tank of this vehicle is not clean, and it was not cleaned before adding ethanol gasoline.
4. Solution: When adding ethanol gasoline for the first time, it is very necessary to clean, inspect and clean the fuel tank of the vehicle, especially for vehicles with long service life. In order to prevent the automobile oil circuit from being blocked by impurities again, the owner has been advised to clean the oil tank as soon as possible to ensure that the oil circuit is clean and smooth.
Three, oil water content exceeds bid fault example
1, date: April 2002
Venue: Nanyang City
Owner: XX Company
Model: Santana car
2. The owner reported that the first box of the car was in good condition after adding ethanol gasoline. Power and fuel consumption are the same as ordinary gasoline, and this is the second box to be added. After refueling, the vehicle is not easy to start, lack of power, poor acceleration, starting, and the vehicle is stuck when shifting gears.
3. Cause analysis: ① After inspection, the vehicle is trouble-free. (2) In view of the fact that the vehicle is a problem after refueling, it is caused by engine oil. (3) check the fuel in the fuel tank, found that there are obvious water droplets.
4. Solution: It is recommended that the owner change the fuel. After the vehicle is filled with qualified ethanol gasoline, the vehicle is normal.
Four, electric oil pump fault case analysis
Example 1, the electric oil pump is damaged by natural aging.
1, date: June 5438+0, 2006
Venue: Zhengzhou City
Owner: XX Working Committee
Model: Hongqi sedan
2. Fault phenomenon: the electric oil pump suddenly loses its oil pumping capacity.
The owner said: I finished adding ethanol gasoline in the morning (for the first time) and went to downtown X to commission business. When he started around 1 1, the vehicle could not start. After inspection by the garage, the fault was that the electric fuel pump didn't pump oil. He replaced it with a new one and asked if ethanol gasoline was corrosive to the oil pump.
3. Cause analysis: The inspection results after analysis and forced decomposition by the maintenance personnel of FAW-Volkswagen Service Station in Chengdong Road, Zhengzhou City: ① The electric oil pump is a maintenance-free product and a disposable part. Although the pump can run after being connected to the power supply, the pump oil pressure is low, which belongs to natural wear and tear damage. ② According to the analysis of the decomposed internal structural components, the pump is a gear pump with a principle structure, and no corrosive parts or easily corrosive rubber parts or plastic parts are found.
4, solution: natural aging damage, replace the new pump.
Example 2: Cause analysis of unclean fuel and fault of electric oil pump
1, date: July 2002
Venue: Zhengzhou City
Owner: private car
Model: Santana car
2. When 2.XX garage was repairing other items of this car, the maintenance personnel found that the electric oil pump was noisy, so it was suggested to check and repair it. Because the host was in a hurry again, he didn't check it. The next day, the oil pump stopped without pumping oil, and the garage sent a car to pick up the faulty car. During the disassembly and inspection, it was found that the oil inlet screen of the electric oil pump was seriously blocked due to the unclean oil tank, and the oil pump was burnt out.
3. Cause analysis: Because the oil inlet of this type of electric oil pump is small, the oil pump loses lubrication and cooling medium after the oil inlet filter screen is blocked by impurities. When the oil pump is idling at high speed, it is easy to cause burning of the oil pump coil and excessive wear of the gear backlash of the oil pump, so that the oil pump is damaged or loses its oil pumping ability.
4. Solution: Pay attention to the cleanliness of the fuel in the fuel tank ① Understand that ethanol gasoline has the characteristics of dissolution and cleanliness, and check or clean the cleanliness of the fuel tank when adding it for the first time; (2) Pay attention to the cleanliness of added fuel to prevent fuel containing more impurities from entering the fuel tank; (3) If the electric oil pump is found to be noisy, it should be checked and repaired immediately (the maintenance personnel suggest that the noise increases after the filter screen of the oil inlet of the oil pump is blocked, because of poor oil inlet and poor lubrication); (4) Pay attention to timely refueling. Fuel has cooling and heat dissipation effect on electric oil pump. For example, the oil pump often works under the condition of poor cooling and heat dissipation, which is easy to be damaged early.
Example 3. Quality problems of electric oil pump
1, date: April 2002
Venue: Nanyang City
Owner: XX Bureau
Model: Santana 2000
2. The owner reported that the new electric oil pump was damaged after a few days of replacement. Ask whether it is related to the corrosion of ethanol gasoline.
3. Cause analysis: The technical personnel of Shanghai Volkswagen Nanyang Service Company identified that the pump was not an ex-factory accessory. After asking the owner and the maintenance personnel of the garage, it was confirmed that the pump was bought in the auto parts market, and the price was relatively cheap (the invoice showed that it was more than 400 yuan, and the original parts needed 1800 yuan). The analysis shows that the pump is a quality problem.
4. Solution: After replacing the original parts, the problem is solved.
Five, mechanical gasoline pump material reason example analysis
1, date: July 2002
Venue: Zhengzhou City
Setting: Songhua River Auto Repair Center, Henan Sinotrans Auto Repair Factory, Tianjin Li Xia Auto Repair Center and Zhengzhou Hongye Auto Repair Factory.
2. The garage reflects that the diaphragm of mechanical gasoline pump is not suitable for some vehicles after using ethanol gasoline in the pilot. If the rubber diaphragm expands and ruptures, the oil pump will lose its pumping function.
3. Cause analysis: In the early production, automobile manufacturers and parts manufacturers mainly chose the materials of spare parts based on the adaptability of ordinary gasoline. Because ethanol gasoline has different requirements for the materials of rubber parts, although the country has made selection instructions for the materials of rubber and plastic parts, the production and supply always need to be timed, and when purchasing these parts, the supplier only indicates the name and place of origin of the parts, but does not indicate the material ratio. Therefore, when shopping, it is indistinguishable from the appearance.
4. Solution: Recently produced diaphragms can generally adapt to ethanol gasoline. If it is impossible to distinguish whether it is an alcohol-resistant accessory, the garage can do a soaking test in advance to distinguish it.
Six, the use of fake and shoddy ethanol gasoline failure example
1, date: August 2002
Venue: Zhengzhou City
Owner: XX Taxi Company
Model: Jetta sedan
2. Owner's reaction: The vehicle suddenly stops at the starting point after refueling, and the engine is easy to stall.
I went to an auto repair shop in the North Ring Road to check the vehicle oil and circuit, and no fault points were found. The oil inspection is also relatively clean. Start trial operation, the fault still exists. As it was getting late, the maintenance staff suggested that a more detailed inspection be done the next day to eliminate it. Reluctantly, the driver drove home again.
At 8 o'clock the next morning, the driver of the car called to inform that the vehicle fault had been eliminated. It turned out that after the driver drove the car back, there was a malfunction after refueling, and it was suspected that it might be an oil problem. After replacing the fuel in the fuel tank and adding qualified ethanol gasoline again, the fault phenomenon disappeared.
3. Cause analysis: ① The water content of oil products supplied by gas stations may exceed the standard; ② It is also possible that inferior gasoline purchased at a low price is mixed privately and faked.
Seven, gas station renovation cleaning unqualified, oil is not clean fault cases.
For example 1, the oil tank in the gas station is not completely cleaned, and the oil product contains high impurities.
1, date: August 2002
Venue: Zhengzhou City
Owner: XX Taxi Company
Model: Jetta sedan
2. The owner reported that the vehicle was difficult to turn off, accelerate and start.
After checking the vehicle oil system, the maintenance personnel in the garage found: ① The fuel is too dirty and contains many impurities. After the fuel in the fuel tank has been precipitated and filtered, there are still about 5 liters of fuel that cannot be used because of too many impurities. (2) to clean the fuel tank, oil circuit, nozzle and other related components, the vehicle returned to normal.
3. Cause analysis: On August 8th, when the vehicle participated in the driving fuel consumption comparison test organized by the provincial pilot office, the fuel tank and oil circuit were cleaned in a standardized way (the average gasoline in the test was 7.5 liters/100 kilometers, and ethanol gasoline was 6. 1 liter/100 kilometers). At present, the source of more impurities in the fuel tank is not the sediment accumulated in the fuel tank, but the unclean oil added by the gas station.
4. Solution: ① Report to the superior competent department and instruct the gas station to rectify immediately to ensure the quality of oil products, safeguard the interests of consumers and carry out pilot work; (2) When refueling, choose a gas station with guaranteed oil quality and a filter.
Example 2: Waterproof measures for oil tanks in gas stations are not in place, and the water content of oil products exceeds the standard.
1, date: July 2002
Venue: Zhengzhou City
Owner: XX taxi
Model: Jetta sedan
2. The owner said: After the vehicle refueled at the gas station, it stopped when driving to the entrance of troup garage, and the car could no longer be started. I had to push the car into the garage for inspection and maintenance. After inspection, the maintenance personnel found that there was moisture in the fuel in the fuel tank, which was caused by too much moisture. All the fuel in the fuel tank is discharged, and the fault is eliminated after refueling.
3. Cause analysis: ① When the ethanol gasoline was replaced at the gas station, the water in the bottom of the fuel tank was not removed, which made the water content of the oil product too high; (2) There is no waterproof and drying device installed on the breathing valve of the gas station oil storage tank. When the environmental humidity is high, the water-containing gas enters through the breathing valve, which increases the water content in the oil over time; (3) There may be precipitated water in the automobile fuel tank, which will cause mutual solubility after refueling and make the water content exceed the standard.
4. Solution: ① When the gas station changes the supply of ethanol gasoline, a waterproof and drying device should be installed on the breathing valve in strict accordance with the requirements of equipment transformation; (2) When the gas station changes to supply ethanol gasoline, the storage tank should be replaced and cleaned as required, and the water at the bottom of the tank should be completely removed; (3) When adding ethanol gasoline to the vehicle, check the cleanliness and waterless condition of the fuel tank.
Example 3: Example of Mutual Solubility of Anti-seepage Coatings for Gas Station Storage Tanks and Ethanol Gasoline
1, date: June 5438+0, 2006
Venue: Luoyang City
Unit: XX Road Gas Station
2. Problem report: Answer the phone to report that the color of ethanol gasoline sold in this gas station is different from other gas stations, and the color is black, like soy sauce. The staff of the oil station reported that the original oil was clear, and after a few days of storage, it was found that the oil changed color.
3. Cause analysis: This is mainly the case.