Intermittent fuel gauge stuck on full

Tiny
J GOWE
  • MEMBER
  • 1987 FORD F-150
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 118,000 MILES
Fuel gauge pinned on full but some times seems to work. Anyone have any idea where to start to solve this problem?
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Monday, May 18th, 2020 AT 5:29 PM

3 Replies

Tiny
KASEKENNY1
  • EXPERT
Do you have dual tanks and I assume if you do then both tanks make no difference?

If so, I attached the wiring diagrams. We need to test voltage coming from the selector switch. You have a number of inline connectors that could cause an intermittent issue. However, the always being on full indicates a short to power. Basically this gauge works off of voltage. The more fuel the higher the voltage which raises the gauge.

Let me know if you have questions. Thanks
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Monday, May 18th, 2020 AT 5:59 PM
Tiny
J GOWE
  • MEMBER
We do have dual tanks. We don't use the back tank it is fouled. We only had the truck a week and she sat for 6 years.
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Monday, May 18th, 2020 AT 6:26 PM
Tiny
KASEKENNY1
  • EXPERT
Okay. Then let's treat it like a single tank. Check voltage on the yellow wire with the key on and see what it is telling you. If it is battery voltage then I suspect the fuel gauge sender has failed. Let me know if you have questions. Thanks
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Tuesday, May 19th, 2020 AT 4:53 PM

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