Is High Fuel Tank Pressure Dangerous?

1 Answers
07/29/25 9:28pm
High fuel tank pressure is a normal phenomenon. During vehicle operation, gasoline sloshes inside the tank, and as temperatures rise after driving—especially under high summer temperatures—the gasoline expands due to heat. Since the fuel tank volume is essentially fixed, internal pressure increases, resulting in a hissing sound when opening the fuel cap. Below are relevant explanations: 1. Causes of high fuel tank pressure: This condition is typically caused by a clogged fuel cap regulator valve or blocked charcoal canister venting, leading to excessive internal pressure. The resulting pressure differential makes the fuel cap difficult to unscrew. 2. Solutions for high fuel tank pressure: Use a vacuum pressure pump to check whether the fuel cap's opening pressure and vacuum control are within normal ranges. If values exceed specifications, replacing the fuel cap will resolve the issue.
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