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What is the reason why the fuel tank cap of Lexus LS500h cannot be opened?

2 Answers

DiEvangeline

07/29/25 12:40pm

Possible reasons include rust or jamming of the fuel tank cap, motor failure, loss of elasticity in the switch spring, or freezing due to cold weather. There are three points to note when installing a fuel tank: 1. Storage location: The fuel tank storage location must be safe to prevent fire. The fuel tank or oil drum should be placed separately in a visible area, appropriately far from the diesel generator set, and smoking is strictly prohibited. 2. After placement: The highest oil level should not exceed 2.5 meters above the base of the diesel generator set. If the oil level in a large fuel depot is higher than 2.5 meters, a daily fuel tank should be added between the large fuel depot and the diesel generator set to ensure that the direct fuel delivery pressure does not exceed 2.5 meters. Even when the diesel generator set is shut down, fuel is not allowed to flow into the diesel engine through the fuel inlet pipe or injection pipe by gravity. 3. Resistance requirements: The resistance at the fuel port must not exceed the specified value for all diesel generators. This resistance value is based on the fuel tank being half full.

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VonMia

08/14/25 12:39am

I've been driving a Lexus LS500h for several years and have encountered the issue of the fuel tank cap not opening a few times. It's mostly a mechanical problem—the locking mechanism gets stuck or rusted and frozen, especially in winter. It could also be that the remote key battery is dead, and pressing the button doesn't work; replacing it with a new battery often solves the issue. If the car isn't fully unlocked, that can also prevent the cap from opening, so make sure the vehicle is in park and all door locks are disengaged. Additionally, a malfunction in the electric fuel tank cap's motor or sensor can cause the system to mistakenly think it's locked, and restarting the vehicle might temporarily fix it. Dirt buildup around the lock area can also jam the cap, so regular cleaning helps prevent this. If these self-check methods don't work, head to the dealership immediately for a professional inspection to avoid forcing the cap open and damaging components, which could affect refueling. Safety comes first.

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