What are the effects of high fuel tank pressure?

[PresleyDella]

High fuel tank pressure has no significant impact and is a normal phenomenon. This occurs because gasoline sloshes inside the tank during vehicle movement, and as temperature rises after driving—especially under high summer temperatures—the gasoline expands due to heat. Since the fuel tank volume is essentially fixed, pressure builds up inside. When the fuel cap is opened, a hissing sound may be heard. Solution for high fuel tank pressure: If the pressure inside and outside the tank is inconsistent, it may make the fuel cap harder to twist. It is recommended to check for any foreign objects in the fuel cap, particularly ensuring the central valve functions properly. Alternatively, use a vacuum pressure pump to test whether the opening pressure and vacuum control of the fuel cap are within normal range. Replace the fuel cap if values exceed the standard limits.