Question about 2002 GMC Sierra 2500HD

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When my truck is full of disel the gage works but when it starts to go down a little it starts to go crasy and then falls to emty even if it under full

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The fuel sender has gone bad. you will have to remove the tank and replace it

Posted on May 12, 2010

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Fuel gage goes from full to emty all the time. when it first stated it only did it with quater tank or less.


Sounds as if the SENDING UNIT in the tank is faulty. They work by RESISTANCE, so when the contacts on the fuel guage sending unit in the tank get worn, it will send incorrect data. Typically it will say full when the actually IS full, then, when the tank is 3/4 full, it will say EMPTY, and then, as you use more fuel from the tank, the guage will go from what is REALLY in the tank, to empty, at different times.

Only solution is to remove the fuel tank, and replace the sending unit guage assembly.

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Gas gage read full when empty and sometimes emty


You have a bad fuel level sensor.The fuel tank needs to come out and the sensor replaced.You don`t have to replace the pump assembly.You can get the level sensor separate.I`m not sure if the parts stores have it but I know the dealerships do.Hope this helps.Good luck.

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I have a 2002 grand prix gt my gas gage goes from full to emty sometimes it goes 3/4 sometimes 1/4 do u no what the problem is


sounds like you need new fuel pump. fuel pump located in gas tank. before you go buy a new fuel pump first push up and down on trunk of car real hard to try to dislodge the little armature inside of tank. this little armature is what sends the signal to the gauge telling you the quantity. push up and down on truck to try to dislodge small signal armature then check your quantity. try this when you are having the problem and i am willing to bet the little armature is stuck. the only way to fix is to buy a new pump.

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a fuel sending unit seems to be the most popular solution. the part is about $40. I think the labor is what's going to kill you.

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