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Why does the fuel gauge only show half full after refueling?

1 Answers

CharlesLee

09/05/25 2:01am

The reason why the fuel gauge only shows half full after refueling could be due to issues with the fuel gauge itself, sensor failure, etc. Here are the specific explanations: Problems with the fuel gauge itself: A malfunction in the fuel gauge can cause it to remain stationary or become inaccurate. A method to diagnose this is if the fuel gauge needle does not move within about half a minute after turning on the ignition switch, or if the needle swings erratically or shows inaccurate measurements, it indicates a fault with the fuel gauge. In such cases, replacing the fuel gauge is necessary. Sensor failure: When the sensor fails, it can also cause the fuel gauge to stop working. The diagnostic method involves using a multimeter to measure the resistance of the fuel sensor's variable resistor by attaching the probes to its two terminals. If the measured resistance does not match the standard value, it indicates a sensor failure. Short circuit in the instrument coil: A short circuit in the instrument coil can also lead to issues with the fuel gauge.

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