What Causes High Fuel Tank Pressure?

1 Answers
EmersonLee
07/24/25 4:59pm
The causes of high fuel tank pressure are: blockage of the car fuel tank cap regulator valve, blockage of the carbon canister, or damage to the solenoid valve. If the car fuel tank cap regulator valve is blocked, it will result in excessively high pressure inside the fuel tank. In this case, it should be disassembled and cleaned. If the fuel tank is overfilled during refueling, some fuel may evaporate and enter the carbon canister, forming particles inside that can cause blockages. If the solenoid valve is damaged, the engine's pipeline system cannot properly ventilate to form a circuit, preventing the release of fuel vapor from the fuel tank, which will cause the internal pressure to rise. Excessively high fuel tank pressure can make refueling difficult, as fuel struggles to enter the tank. If the fuel tank pressure remains too high for an extended period, it can cause deformation of the fuel tank and potentially damage the fuel pump.
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