why does my gas gauge keep going up and down

Best answer


Could bepower fluctuations to the fuel gauge sending unit,a bad sending unit or a bad gauge. The sending unit would be the most likely cause. My fuel gauge keep goin up n down y? The fuel sensing unit is going bad. It will have to be replaced for accurate measurements.

People also ask


  • Why is my gas gauge not working?

  • Running low on fuel can also cause the fuel pump to pick up sediments, which clog the fuel filter, fuel injectors, or high pressure fuel pump. If your gas gauge isn’t working, it’s important to identify the source of the issue, then make a plan for repair. Read on to learn the most common causes of broken gas gauges and how to identify them.

  • How do I know if my gas gauge is full?

  • Pay special attention to whether or not the gas gauge sweeps smoothly from EMPTY to FULL. Note that some self-test steps may stop the gas gauge at 1/4, 1/2, and 3/4, as well. Fuel sender test. The fuel sender test should be conducted when the tank is lower than HALF, to prevent fuel splashing.

  • How does a fuel gauge work?

  • In a fuel tank, as the fuel level rises, the fuel sending unit float rises, and a variable resistor changes the resistance in the electrical current running to the gauge so it reads full. Depending on the amount of electrical resistance, the gauge will rise or fall according to the signal.

  • Why does my fuel gauge needle not complete a full sweep?

  • Older vehicles may have a different sequence, such as turning the ignition key on/off, on/off for two or three cycles. If the fuel gauge needle doesn’t complete a full sweep, you now know the problem is with the fuel gauge.

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