Fuel gauge stopped working?

1989 FORD F-150
215,000 MILES • 6 CYL • 4WD • MANUAL
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DOREEN ROBINSON
  • MEMBER
  • 1 POST
It shows it’s on full all the time until you turn the key off, then shows it’s on empty when you turn the key to off and remove key it’s not registering right correctly.
Sep 24, 2022 at 4:23 AM
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MIKE H R
  • MEMBER
  • 3,094 POSTS
Check the wires on the fuel sending unit that is in the gas tank, over the years they can get loose or corroded. With the year it is also posible that the sending unit itself is going bad
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Mike
Sep 24, 2022 at 4:36 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,488 POSTS
Does the reading change when you move the tank switch from one tank to the other? If so, the switch could be bad, if you do not have dual tanks the sender has probably gone out as Mike has suggested. Here are the fuel gauge wiring diagrams so you can see how the system works. Check out the images (below). Please let us know what happens.
Images (Click to enlarge)
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Sep 27, 2022 at 4:51 AM
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