Question about 1999 GMC Suburban

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Fuel guage malfunctioning, will only register fuel between 1/2 ful and empty.

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This problem is caused by a defective fuel gauge sending unit, it is located inside the gas tank, replace it.

Posted on Oct 06, 2009

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Replace the sending unit

Posted on Oct 06, 2009

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My fuel gauge worked yesterday and toady it will not register anything but empty. What could possibly be wrong with my car?


could be a few thing's, most obviouse not a lot of fuel but I take it you have plenty in your car, sticking fuel guage,faulty connection somewhere, or a dicky guage are some of the causes

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When my fuel tank is full the guage registers empty


Could be a problem with the gauge in the instrument cluster, or the wiring that goes back to the tank, or the sending unit in the tank.
The sending unit has a float much like your toilet which could stick or fail to move.

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Replaced fuel pump replaced replaced fuel filter everything works fine except fuel guage will not register. put 25 dollars fuel in tank still will not register help!!!


Possible that the fuel tank level sensor is not working or conneccting to the dashboard meter. You need to check if the float of the rheostat is damaged as then it will not act if the float is damaged.
Also if the rheostat is damaged it will not indicate as the resistance is open.
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My fuel guage stays at 3/4 tank no matter how much gas I have. What do I do?


Find the wire on the top of the tank and ground it with a test light,with the key on,if it goes to empty,then unplug it from the tank,the fuel gauge should go to ful,if it does these two things,then it is in the sending unit in the fuel tank.If it does not move,then replace the fuel gauge in the dash,If this was at all helpful,please rate,thank you.

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1 Answer

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1 Answer

Fuel gauge doesn't register correctly


The fuel gauge sending unit is in the fuel tank in a module along with the fuel pump, and float guage. It sends an electronic signal to the fuel guage on your dash. When it becomes worn or the float may even have a leak in it, the unit sends incorrect info to your guage. The solution is to empty your fuel tank, drop it from the vehicle, remove and replace the entire module.

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1 Answer

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The voltage regulator may be defective. Do all the guages work?

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