why is my gas gauge going up and down

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Q: gas gauge goes up and down while driving on flat roads The most common cause of erratic fuel level is caused by adefective fuel level senderin the fuel tank is defective or out of position or restricted from going all the way up to full position. Click to see full answer.

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  • 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 fuel gauge sender is bad?

  • Fuel gauge behaves irregularly. One of the first signs that you have a problem with your fuel gauge sender is when it behaves erratically. A bad sending unit may cause the fuel gauge to suddenly shift positions, or give an erroneous reading.

  • 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.

  • What happens if the fuel gauge resistor is bad?

  • A bad fuel gauge resistor can transmit a bad signal to the instrument cluster, causing the gauge to permanently read full. This poses a problem since the driver must know the correct fuel level of the car so he or she won鈥檛 run out of fuel. The fuel gauge sender is not a regularly serviced part.

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