Bad fuel gauge or sending unit -
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Unread 03-15-2015, 03:44 PM   #1
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1997 ZJ 
Join Date: Aug 2014
Location: Reynoldsburg, Ohio
Posts: 55
Bad fuel gauge or sending unit

So I filled up drove for a wile and the gauge wasn't dropping then it started to drop to 3/4 at what seemed to me a normal rate. I filled up and it took 7 gallons to fill from 3/4 to full. It also took about 5 minutes for the gauge to read full after filling. Now is this a sending unit problem or a guage? I have a 100 mile drive round trip to work and woollike to not run out of gas on the road

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Unread 03-16-2015, 11:33 AM   #2
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1997 ZJ 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 4,764
There was a recall on that 97 sending unit. Drop by a dealer and let them put your VIN# in the system to see if it was done. If get a freebie...labor and all.
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Unread 03-16-2015, 12:05 PM   #3
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1997 ZJ 
Join Date: Nov 2014
Location: , OK
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If you filled it up all the way up into the fill hose until it won't take any more, i.e., "topped it off" like so many of us do, there will be gas above the float that has to get used before it will start to drop. 7 gallons until it reads 3/4 sounds OK, I think. I've refilled mine at 3/4 once and I think it was 6-something. I've got out of the habit of topping it off after I soaked my shoes in gas a couple of times. I usually go up to the next round 5 or 10 cents after it shuts off the first time, but mine still doesn't move off of Full for a little while. My gauge is slow to go up too, but it doesn't take it 5 minutes. Maybe a minute.

I've drained the tank 3 times in the past 4 months from a little below 1/8 on the gauge and it had ~6-1/2 gallons in it. One time I drove 9 miles straight to the gas station after putting the 6-1/2 back in, on the county roads at 35 mph, and I put 18.6+ in it to top it off. Maybe the pump was cheating me.
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Unread 03-16-2015, 09:59 PM   #4
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1996 ZJ 
Join Date: Jan 2012
Location: Central, Ohio
Posts: 4,562
Good tip by Oldfrog! Rather than going to the dealer, type your VIN into the below form. It will immediately show what recall work has not been completed or is outstanding on your 97. Of course only the dealer or reputable shops which report this work completed is included.

You don't need to register or login when checking for this recall work.

Link courtesy of a larger Jeep/Chrysler link supplied by member MrRoundel.

Now for the not so technical stuff. Next time you fill up and your gas gauge is super slow going up smack the bottom of the fuel tank with a 2x4 while then looking at the gauge quickly. Good chance it may go up pretty quick and really doubt if the gauge in the dash is bad. Good luck.
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