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Why does the fuel gauge indicator light stay on after filling up the car with gas?

2 Answers

VonKaleb

07/29/25 3:39pm

After filling up the fuel tank, the fuel tank float rises so high that the contacts and sliding piece of the fuel level sensor cannot reach the edge position, sometimes even disconnecting. This results in a high resistance, similar to the situation when the fuel is low, causing the fuel warning light to activate and stay on. The fuel gauge indicator light staying on is caused by the following reasons: 1. Fuel level sensor malfunction: The fuel level sensor detects the position (height) of fuel in the container by measuring the change in capacitance between the sensor casing and the sensing electrode when fuel enters, converting this change into a current change. If possible, you can replace the fuel level sensor at a repair shop. 2. Wiring fault: When there is a short circuit or open circuit in the wiring, the information from the fuel level sensor cannot be read, resulting in the indicator light staying on.

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RoseAnn

08/15/25 3:06am

I remember one time after refueling, the fuel gauge light was still on, which really freaked me out. At first, I suspected the gas station's meter was inaccurate, but even after driving for a while, the light didn't go off. This is usually caused by a stuck or faulty fuel sensor. The sensor is inside the fuel tank and, after being submerged in fuel for a long time, it might get stuck in the low position, or poor wiring contact could lead to false readings. If you notice the light is on after filling up, try turning the car key on and off a few times to reboot the system—sometimes soft faults can resolve themselves. Safety is paramount because an inaccurate fuel gauge might make you think you're out of gas while driving, increasing the risk of accidents or wasting money on unnecessary refueling. It's advisable to address the issue immediately after checking. I’ve learned to do simple checks like inspecting the fuse box; if a fuse is blown, replacing it might solve the problem. However, for more complex issues, it’s safer and more convenient to consult a professional mechanic. When driving, pay attention to the engine sound, and after refueling, let the car idle for a while to observe the light’s behavior.

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