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Why can't the fuel tank cap be opened?

2 Answers

EmiliaLynn

07/24/25 9:48am

It is relatively common for the fuel tank cap to get stuck or rust, preventing it from opening. Here is an introduction to fuel tanks: 1. Introduction: The automotive fuel tank is the full name for the car fuel tank. Currently, with the development of the automotive industry and the revitalization of the domestic automotive sector, major automobile manufacturers have shown a significant increase in demand for automotive fuel tanks. 2. Principle: Utilizing the heat energy generated by the engine during vehicle operation, a thermal circulation system is added between the engine, fuel tank, and radiator. 3. Classification: Iron fuel tanks and aluminum alloy fuel tanks. With the development of various new materials, the rust prevention issue of iron fuel tanks has become the biggest problem affecting tank quality, especially in today's environmentally conscious world. In the heavy-duty truck sector, the quality of fuel in China is a key issue affecting the advancement of new models, with the quality of the fuel tank, which holds the fuel, being a major focus.

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SanSara

08/11/25 5:03am

I've been driving for over a decade and have encountered many frustrating situations with fuel tank caps not opening. The most common issue is the cap getting stuck, which can happen due to road dust, rust from rain corrosion, or aging and deformation of the cap material. In hot or cold weather, thermal expansion and contraction can make it even tighter. Additionally, some cars have locking mechanisms, such as remote-controlled caps, where a jammed lock or wiring fault can also prevent opening. My advice is not to force it, as this could damage the entire fuel system. Try spraying some lubricant around the joint and gently tapping around the cap—sometimes that loosens it. If all else fails, take it to a repair shop; don't compromise safety just to save time.

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