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The problem is either with the sensor in the fuel tank or in the wiring from the tank to the gauge.

I have the same problem. turn the key on and the gage goes up past full and stays there.

I started at the fuel tank and worked my way back to the dash board. I have had the dash console out many times for this problem. No go. The other day while under the dash board with the key on. Remove the fuse panel cover. I reached up to the right side of the steering colum and gently moved the wiring harness around. Then to the left of the steering colum same thing . the gas gage started comming down to 1/2 full. when i moved the truck it went back up to full.

I think I will find the answer next week when i trace the wire from the gage. and put a bypass wire to the old fuel tank sensor i have siting on the front seat. got my fingers crossed

Usually it is the sending unit in tanks. They get corroded, you either have to replace whole pump unit or take sending unit apart and clean up corrosion and contact points.

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Q: Fuel gauge goes past f and stays replaced fuel gauge still does it any suggestions 1988 ford f 150 dual tanks?
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