Question about 2004 Pontiac Grand Prix

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Fuel gauge moves back and forth from full to empty

When the gas goes down to half a tank the needle on gauge moves back and forth so you don't know when tank is low

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  • Anonymous Mar 31, 2014

    gas gauge is not working properly, all in the same hour it will go from empty to half full to full please help

  • Anonymous Apr 01, 2014

    i put half a tank of petrol and the needle has not move

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  • Master
  • 958 Answers

You have a bad sending unit inside your tank.
the resistance of the potentiometer inside is broke on the half tank part.

you have to replace it.

tnx 4 using fixya.

drcool

Posted on Oct 05, 2008

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Posted on Jan 02, 2017

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If you remove the sending unit in the gas tank, move it manually by hand as u saw done earlier, the gauge on the dash should also move. As long as the sending unit in the tank isn't 'stuck' at the half full level, the gauge should register empty to full as it moves. To be honest, I'm not sure if I would bother taking the sending unit out. 1st, u must be very careful not to blow yourself up when working on the gas tank (no sparks, etc), all u really need to do is fill up your car, see how many miles a tank of gas will go (carry a can of gas with u to see how many miles before u run out). If it's 350 miles, just set the trip gauge to zero every time u fill up, and get gas every 300 miles so u don't run out. If the sending unit moves freely, everything (wiring ) is connected properly, then it probably is the fuel gauge. good luck!

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