why does my gas gauge keep going up and down

Best answer

The sender is the problem

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 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.

  • 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 long does it take for your gas gauge to empty?

  • After I put in gas and filled it to half a tank, the gas gauge went down to empty in just over an hour of continuous driving. I filled it to half a tank again and drove for 30 min. And it went down almost to a quarter of a tank and it usually barely moved after 30 min.

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