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More than likely it will be the armature on the fuel gage sending unit in the tank/tanks. Pull the sending unit(s) out and test the resistance in the two posts going to the armature. Should be 165 +- 5 ohms full and around 10 +-5 ohms empty. (must manually move the float while testing resistance)

If it isn't within factory specifications, sending unit is bad. If it is, then there is a wiring issue up to the gauge.

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Q: How do you fix a fuel gauge in a 87 f150?
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