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First, check the wiring from the instrument cluster to the fuel tank sender... more than likely, if all the other gauges are working, then the in-tank sender is bad. That requires the tank to be drained and dropped, unless you feel like cutting a hole in the floorpan of the cargo area. This is a common issue with the 80s Ranger-based vehicles, the gas gauge not working correctly. My 87 acts screwy... I've actually only had to put half a tank of gas in to top it off from 1/4 tank... these things have 23 gallon tanks....
Anyhow, you will need a wiring diagram for your truck (autozone online repair guides, chilton's or haynes) and a meter to check things out. Sometimes the connector on top of the tank goes south due to corrosion, dirt, water, you name it. Hope this points you somewhere in the right direction.
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1987 Bronco II XLT 2.9L V-6 5-Spd 4x4
'xplorer coils & leafs, MT/R 30x9.50s, 2 1/2" cat-back
2004 Toyota Tacoma Xtracab SR5 3.4L V-6 5-Spd 4WD
(K&N air, all else is bone stock!)
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