I have a 1988 broncoII, the fuel gauge worked fine until recently. It just sets on the e side and the low fuel light is on even after fill up. Any Ideas?

Randy

 

Sending unit on pump bad / something unplugged.

 

Could be one of the following:
1) Bad sending unit in the tank
2) Bad connections to sending unit
3) Bad connection to ground
4) Broken / bad wiring between fuel gauge and sending unit
5) Bad fuel gauge
6) Bad instrumentation voltage regulator

First off, do all of the gauges work (temp, fuel, oil, etc.)? If it's ONLY the fuel gauge that is not working, what you'll need to do is trace the wiring from the instrument cluster to the tank. Check all the connectors to make sure they're good. Look at the grounds for the pump and sender and make sure they have a good connection, and that all of your ground connections are good. The incoming wire from the voltage regulator should be black w/green stripe, the wire from the gauge to the sending unit should be yellow w/white stripe, and your ground wires should be solid black. I'm guessing someone did some previous repairs to the wiring on my '87, as there are wires taped up and I guess butt-spliced in the wiring harness loom underneath going to all that stuff, but I haven't opened it up to see what's what (all my gauges work, the fuel gauge on mine is kinda quirky after you get down past half tank towards empty, which is why I use my trip odometer). If you don't have a Haynes or Chiltons or Helm manual, you can use the repair guides on autozone.com, there are wiring diagrams on there. Hope this helps.

 

Thanks for the info, looks like I will need to do some digging around.