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Old May 8th, 2017, 06:56
tjmotter tjmotter is offline
NAXJA Member
Join Date: Sep 2011
Location: Houston
Posts: 347
'90 XJ Fuel Gauge acting up

Looking for insights on where to look for an issue with a '90 XJ 4.0L.

- when full, the fuel gauge seems to act normally
- at 3/4 of a tank, the gauge shows full
- at 1/2 tank the gauge shows a little less than full
- at 1/4 tank the gauge still shows a little less than full but will randomly peg the needle almost to the bottom of the gauge, back off and then do it again

Not the best way for me to recognize I need to fill up ;-).

This is a new issue. The gauge has worked perfectly up to now. This vehicle is very lightly used (maybe 500 miles per year) and can go months without starting. I keep it on a battery tender and locked up safely in a garage so there is no exposure to the elements.

Not sure where to start on this one. My initial thought was to remove the gauge cluster and clean all the contacts but when I first bought this XJ, it was very tough to start and I found that the short rubber hose that connects the fuel pump to the outlet in the tank had come loose causing a fuel pressure issue. I am probably over thinking this since the XJ runs like a dream but am wondering if this problem has re-occurred causing a high pressure flow of gas to hit the sending unit when the tank is low.

Pulling the pump is my last resort. Hoping y'all can give me some ideas on other areas to check.

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