Features Provide air pressure balance: The fuel tank cap has an exhaust hole to adjust the air pressure balance inside the fuel tank, ensuring the normal operation of the car and avoiding engine stalling caused by abnormal fuel injection. Drainage function: The fuel tank cover is designed with drainage holes to ensure that the water around the fuel tank is effectively drained, avoiding damage to the fuel tank caused by accumulated water. Record fuel model: The recommended fuel model is marked on the fuel tank cap, making it easy for car owners to know the type of fuel added at any time. .