What to Do When There's a Suction Sound When Opening the Fuel Tank Cap?

1 Answers
VonAngela
07/24/25 10:12pm
When there's a suction sound upon opening the fuel tank cap, you should check the carbon canister or solenoid valve. A malfunction in the carbon canister or solenoid valve can cause the pressure inside the fuel tank to be lower than the external pressure, resulting in the suction sound. Occasionally hearing this sound is normal, but if it occurs frequently, it's advisable to have it inspected and repaired at an auto repair shop. Here are some related details: 1. Generally, the carbon canister in a car's fuel tank helps balance the internal and external air pressure. If the carbon canister malfunctions, the fuel tank cap loses its pressure relief function, leading to pressure imbalance. 2. When the internal pressure of the fuel tank is lower than the external pressure, it can cause the tank to deform or even get damaged. Severe deformation may prevent fuel from being added, leading to the inability to refuel and potentially damaging the fuel pump over time.
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