Fuel selector or not?
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Joined: Feb 2009
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Fuel selector or not?
Thanks for looking. I brought home a 87 f250 diesel that was sitting for 3 years. It took a while to get the fuel lines and returns cleaned up and also to kill the mildew in/on it. I got it to run and got all the lights working and it's driveable now. Both tanks showed full when I picked it up, and I saw the fuel level going down on the gauge over time. But all of a sudden, the fuel gauges read pegged on full for one tank and dead empty on the other. I may have driven the truck 80 miles or so over the last few months, all on the front tank which reads "full" now. I changed to the "empty' tank and have made one trip to town and back on it (20 miles or so round trip). Does this symptom mean I need to replace the fuel selector switch, or is it more likely indicating a short or open condition somewhere in the wiring? Is it likely that the electric selector valve hasn't changed over and I'm still using fuel from the front tank?
Cross-Country
Joined: Apr 2020
Posts: 94
Likes: 5
From: Montana
When I was working on a turn signal issue. When my truck was running I unplugged the fuel selector switch in the lower left dash panel and my fuel gauge went to full immediately.
I suspect you lost a ground to the front tank. I would just run a new ground wire for the front and see if that helps then fix the rear tank.
I suspect you lost a ground to the front tank. I would just run a new ground wire for the front and see if that helps then fix the rear tank.
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