Is it normal for a car's fuel tank to leak when filled to the brim?
2 Answers
Overfilling the fuel tank can cause damage to the vehicle. When the tank is filled too much, the expansion of gasoline due to temperature changes can potentially rupture the fuel tank. Therefore, vehicles are designed with vent holes at the top. If the tank is overfilled, excess fuel will spill out through these vent holes. Below are the hazards of overfilling the fuel tank: 1. Excessive fuel can expand and overflow due to temperature changes, increasing the risk of vehicle self-ignition. 2. Overfilling can damage the carbon canister, as surplus gasoline may flow into the canister along with fuel vapors, causing internal damage. 3. If the carbon canister is damaged, it will fail to filter gasoline vapors, allowing gasoline to enter the vehicle's interior. Since gasoline contains various harmful substances, prolonged exposure to gasoline vapors can be detrimental to health and may even lead to cancer.
I've been driving for over a decade and have encountered fuel leakage after filling up the tank, which is absolutely abnormal. It might be caused by a loose fuel cap or aged sealing ring – gasoline tends to overflow when the tank is full. I remember last summer when I refueled and returned home, I noticed oil stains on the ground, which turned out to be due to a damaged rubber seal on the fuel cap causing leakage. This is extremely dangerous as gasoline is highly flammable; parking in a garage or under sunlight significantly increases fire risks and also pollutes the environment. My advice: avoid overfilling the tank to prevent liquid spillage; regularly inspect the fuel cap for integrity, and immediately visit a repair shop to replace any faulty parts if abnormalities are found – never delay. Older vehicles require extra attention to these maintenance details – safety always comes first.
