Question about 1997 Chevrolet Lumina

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I have 2 problems, one is my fuel gauge isn't working properly, wondered if it's the fuel sending unit or something else, and 2, if someone could tell me why i have a 3rd brake light, but the other br

My fuel gauge isn't working properly on my 97 chevy lumina sedan. i was wondering if it is the fuel sending unit or if it could be something else.

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  • Ray Keckeisen May 11, 2010

    what is the other problem

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It could be a couple of things it could be your sending unit. a bad wire. or possibly the gauge its self. but the bad thing is you have to take your gas tank down to check the wires and sending unit. if you take the tank off you can pull out the fuel pump and sending unit and use a ohm meter to see if the sending unit is reading all the ranges correctly hope this helps you out

Posted on May 07, 2009

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Posted on Jan 02, 2017

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They work like this: in the instrument cluster, a small voltage regulator sends low voltage through the gauge, into the wire to tank, and to the sending unit. The unit has a variable resistor that varies according to the fuel level, measured by the float arm attached to the unit. What it (the gauge) actually measures is resistance to ground-the current goes to a ground point after going through the variable resistor in the sending unit.

You can check if problem is the gauge or the sending unit by grounding the fuel gauge wire at the gas tank connector. Pull the electrical connector apart and locate the fuel gauge wire. Jumper that wire to ground on the frame while watching the fuel gauge needle for movement. DO NOT ground it for more than a split second, just touch to ground while someone watches the gauge. If the gauge needle moves at all (will probably go to full or empty), then the problem is the sending unit in the tank. The gauge is good, so is the wire from gauge to tank. I should mention that doing this test can possibly blow the meter (gauges) fuse in the fuse panel- why I said to do it just for a brief moment.

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