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What Causes the Suction Sound When Unscrewing the Fuel Tank Cap?

1 Answers

DelLuke

07/30/25 9:22am

Unscrewing the fuel tank cap and hearing a suction sound is due to the internal pressure of the fuel tank being lower than the external atmospheric pressure. The fuel tank cap refers to the component on a car used to store gasoline, typically square in shape, made of stainless steel with good sealing properties. Its opening is circular and only about the size of a bottle cap. Solutions for a fuel tank cap that cannot be opened normally include: 1. Remove the liner inside the trunk that covers the fuel tank; 2. After locating the locking mechanism of the fuel tank cap, pull the release cable to open it. The fuel tank is a container in a car designed to hold fuel, specifically used in hydraulic systems to store hydraulic oil or fluid. Its main functions include dissipating heat, separating air bubbles from the oil, and settling impurities.

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