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check your ground wire to the gauge

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15y ago
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Q: Eb falcon 1993 fuel gauge shows full then drops to empty and wont work?
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The fuel gauge works on a variable earth type resistor. Basically if you were to ground the fuel float wiring to earth, it would shoot all the way to full. So I could say there may be a short in the earth circuit. Or what somethimes happens is the gauges over time begin to stick. Just give the top of the dash a tap. The gauge may resolve it's self if you do this, other wise I'd be loking a the fuel float circuit.


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