Inquire about the card insertion of refueling machine in PetroChina gas station: This method is also applicable to registered cards. After the card is inserted into the tanker, the refueling machine will automatically display the account balance of the refueling card.
Telephone inquiry: You can call the customer service hotline of China Petroleum Kunlun Fuel Card: 4008 108 100, select the language and operation options according to the voice prompts, enter the fuel card number and password, and select the "Query Balance" option, and the system will automatically broadcast the fuel card balance.