need confirmation that fuel sending unit will fix erratic guel gauge -

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post #1 of 7 Old 06-13-2012, 03:01 PM Thread Starter
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1998 ZJ 
Join Date: Jun 2012
Location: Del Rio
Posts: 9
need confirmation that fuel sending unit will fix erratic guel gauge

I have 98 zj and have replaced the pcm a while back...I had all the standard issues, stalling, dying, hesitaiton, etc, etc...jeeps seems to better since pcm has been did stutter once on a 3hr trip but hasn't done it since...

however, my fuel gauge is acting weird...usually with 1/4 of a tank left (more or less) the guel guage drops to E and the low fuel light goes on...then it jumps back to normal...

before y'all say to do a search...i did...just spent about 45 minutes looking through old threads...however, I didn't find any concrete answers...a couple of threads suggested the gauge cluster be replaced and others suggested the sending unit on the fuel pump was the problem...but I didn't read a single thread that gave a difinitive answer...

(oh, and I also read how a bad pcm might be the culprit, which worries me and makes me think i might have to replace pcm again)

so, has anyone solved this problem??


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post #2 of 7 Old 06-13-2012, 03:48 PM
coralman's Avatar
1998 ZJ 
Join Date: Jul 2010
Location: florida
Posts: 7,257
Mine was doing that. The pump was going too so I replaced the fuel pump module. Problem fixed.
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post #3 of 7 Old 06-13-2012, 04:05 PM
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1998 ZJ 
Join Date: Dec 2008
Location: Exeter, RI
Posts: 7,346
Yes, it typically fixes the problem. But as with all things in life there is never any guarantee.
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post #4 of 7 Old 06-13-2012, 04:20 PM
ratmonkey's Avatar
1997 ZJ 
Join Date: Dec 2006
Posts: 19,793
it's a standard chrysler sending unit issue. vehicles from the 90's through 2006 or so do it straight from the lot.
new sending unit will probably fix it, but not always.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #5 of 7 Old 06-13-2012, 05:23 PM
coralman's Avatar
1998 ZJ 
Join Date: Jul 2010
Location: florida
Posts: 7,257
I could be wrong but I don't think the signal from the unit directly feeds the gauge. It goes into the bcm or pcm also I think. So yep, could be more to it than just the unit.
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post #6 of 7 Old 06-13-2012, 06:27 PM
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1997 XJ Cherokee 
Join Date: Jan 2012
Location: Labelle
Posts: 183
My 97 4.0 also does the same exact thing. I figure it's the sending unit, in the tank. You gotta figure the gas sloshing around when below half a tank, constantly works the sending unit, and eventually (170,000 miles on mine) wears that particular place out. I'm used to it by now, and considering the cost of a new pump/sending unit , not to mention having to drop the tank to do it, I'll just wait till the pump gives out first. I too, have a reman ECM/PCM, and it had no effect on the gauge problem. Just one of those MANY jeep things. But, I think we tend to forget just how old, and how many miles we have on our rigs. Most any vehicle with over 150,000 miles will also have a ton of problems. I do wish we had less computerized crap, but we got what we got. I would have never guessed that a 1997 vehicle would be so advanced with all the sensors, etc. etc. Like for instance, how many vehicles have a temp sensor under the battery? Or a low washer fluid sensor, low coolant tank sensor, etc. etc. When they all work, it's wonderful. When they don't, it can be a nightmare.
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post #7 of 7 Old 06-13-2012, 10:15 PM Thread Starter
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1998 ZJ 
Join Date: Jun 2012
Location: Del Rio
Posts: 9
thanks for the advice...I guess I'll just wait 'till the fuel pump gives out and hope that fixes the fuel really isn't that bad, it only acts weird at about he 1/4 tank mark...above that it's fine (so far)...I'm not ocd or anything, but I do like my cars to perform as they should, especially an older vehicle because people expect things to be wrong and are surprised when older cars look and perform well...

well thanks again and y'all have a good one.
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