What Causes High Fuel Tank Pressure?

[SanGrant]

The reasons for high fuel tank pressure are as follows: 1. Clogged fuel tank cap regulating valve: High fuel tank pressure may be caused by a clogged fuel tank cap regulating valve, a blocked carbon canister, or a damaged solenoid valve. If the fuel tank cap regulating valve is clogged, it will affect the fuel tank pressure, causing it to become too high. In this case, it should be disassembled and cleaned. 2. Carbon canister blockage: If the fuel tank is overfilled during refueling, some fuel may evaporate and enter the carbon canister, forming particles inside and causing a blockage. If the solenoid valve is damaged, the engine's pipeline system cannot properly ventilate and form a loop, preventing the release of fuel vapor from the fuel tank and leading to increased internal pressure. 3. Hazards of high fuel tank pressure: Excessively high fuel tank pressure can make refueling difficult, as fuel may struggle to enter the tank. Moreover, if the fuel tank pressure remains too high for an extended period, it can cause the tank to deform and potentially damage the fuel pump. High fuel tank pressure is a common issue, but in most cases, regular cleaning and maintenance of the fuel tank, along with avoiding overfilling during refueling, can prevent problems.