Is it normal to hear gas when opening the fuel tank cap during refueling?

1 Answers
DeBrayden
07/30/25 6:55am
It is normal to hear a small amount of gas escaping when opening the fuel tank cap during refueling. However, if a large amount of gas is released, it may indicate a clogged carbon canister, and you should consider having it inspected at a repair shop. Gasoline is a volatile substance and naturally produces vapor. Under normal circumstances, this vapor is not allowed to be released into the air to prevent pollution, which is why car manufacturers designed the carbon canister. Methods to check the condition of the carbon canister solenoid valve: 1. If gas sprays out when opening the fuel tank cap, it indicates a damaged solenoid valve; 2. If gasoline vapor or dripping oil appears at the carbon canister's atmospheric vent, it indicates a damaged solenoid valve; 3. Symptoms such as weak acceleration, jerking, unstable idle speed (fluctuating up and down), indicate a damaged solenoid valve; 4. If the engine fails to start after shutting off or produces abnormal noises while driving, it indicates a damaged solenoid valve.
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