Sounds like stuck floats to me. Unless they are actual sensors. In that case they are not reading correctly. And therefore should be replaced. Unfortunately either way I think you are going to have to pull the tanks. Not a fun job at all. If you have an OBDII and I think you do. Go to our local parts store and they can hook up to it and pull fault codes from the ECM (electronic Control Module). You might get lucky and it will tell you what is wrong. If that doesn't work out for you. Consult with Ford, either online or at the dealer. They might be able to steer you in the right direction. Probably try to steer you into one of the repair bays. But you stay strong, resist the service person. You can do this, I believe in you! Well I know I can do it. Therefore I believe you can too!
Good luck,
Jason
SOURCE: 1987 fuel level guage issue
the gas is regulated from the switching valve you control off the dash. Check the valve to hear it switch
have a friend help you do this. it will be located under the truck between the two tanks. You may have a faultly valve or switch rattling inside changing the tanks setting also while driving which will be hard to tell
SOURCE: My F-150 has dual tanks and the rear tank empties
the wiring in the dash on the switch is reversed....your switch will have 6 wires on it two one one sde two in middle and two on other side...change the two sets of wires on the outsides only the middle wires stay put
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