Fuel Gauge Pegged On Full ???

[coyote kid]

i had about a quarter of a tank i then added about a gallon i had in a can and about 500ft down the road my fuel gauge started to go up .. and up .. and up until it was pegged on full any ideas on where to start

[Knucklehead97]

Mines done the same since before I bought it. I've been told that its a short, or bad ground. But I think its the gauge cluster personally. Mine never goes under full. Even when the trucks off. It actually is over full on top of that screw. I posted because I'm interested in figuring mine out as well :D

[ComancheKid45]

Check and clean ground behind the Drivers side tail light.....likely a bad connection there ;)

[rmoore1031]

Sounds like unlimited fuel! Share that magical can around :)

 

Its probably a bad ground that needs cleaning.

[onlyinajeep726]

Do Cruiser's ground refreshment...

 

The full list can be found here: http://comancheclub.com/topic/36382-cruisers-renix-tips/

 

Improving the Instrument Panel Ground

The ground point for the complete instrument cluster on your XJ or MJ is located up under the driver’s side dash. If you lay on your back and look up under there with a flashlight, without wearing a hat, you will see a black wire attached to a shiny piece of metal almost directly above the hood release knob. The screw will have either a ¼” or 5/16” head on it.

This ground point is responsible for handling the ground circuit for the following items: Dome lamps, Seatbelt and key warning, trans comfort switch, wiper switch, headlamp switch and delay module, fog lamp switch, cargo lamp switch, all instrument panel grounds and illumination, power windows and door locks, cruise control dump valve, and a few more things.

The problem is that where the ground point is located does not have a good contact with the chassis where the ground should be. The solution is simple.

Make up a jumper wire with #10 gauge wire about 10” long. On one end, crimp on a ¼” round wire terminal. On the other end, crimp on a 3/8” round wire terminal.

Remove the screw from the existing ground wire and attach the small terminal of your jumper so that the original wire and your new jumper share the same attaching point, one over the other.

Look above the driver’s side plastic kick panel just forward of the top of the hood release knob. You will see an 8mm stud there. Attach the large terminal end there with a washer and nut over it tightened securely.

**Special note for Comanche owners: Make your jumper wire 12” long and attach it on the driver’s side kick panel close to the fusebox on the 8mm stud.**

Revised 11-29-2011