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Unread 02-02-2011, 12:51 PM   #1
Mules50
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1987 YJ Wrangler 
 
Join Date: Jul 2010
Location: Salem
Posts: 29
87 YJ Fuel Gauge Issue

I have an 87 YJ wrangler 4.2L I6. I am thinking that something is wrong with my fuel gauge or fuel sending unit.

My symptoms are:
Fuel gauge is not very responsive. It either sits at full or drops down to empty. There is no rhyme or reason to it. Some days I will fire it up and it will read full, others empty.

I was just wondering what I could do to test to see wether or not it is the gauge or something more serious. And by serious, more complicated and time consuming to fix.

IMO, I do not believe it is the gauge. If the gauge was broken, I believe that it wouldn't move at all. But I am not familiar with any gauges, so just looking for some opinions on what it actually broken or ways I can troubleshoot to figure out what is broken.

Any thoughts/opinions/suggestions are greatly appreciated.

Thanks.

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Unread 02-02-2011, 01:33 PM   #2
lesterss
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Join Date: Sep 2009
Location: iowa
Posts: 13
Yjs have notoriously bad sending units that read gas level in tank and send that info to the guage, I use my trip milage and fill up as appropriate.

Or you can drop the tank spend a few hundred and get a new one.
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Unread 02-02-2011, 01:59 PM   #3
Mules50
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1987 YJ Wrangler 
 
Join Date: Jul 2010
Location: Salem
Posts: 29
Thats what I was thinking too. But the only requirement you need to follow the odometer is to have the odometer working correctly, which mine doesn't . I was thinking of just getting a Jerry Can and just getting some gas every couple of days or so.

If it was just the gauge, then I might replace but seeing as its probably the sending unit, inside the tank, then I prob not gonna worry bought it.
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Unread 02-02-2011, 03:51 PM   #4
Mark05059
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1989 YJ Wrangler 
 
Join Date: Mar 2009
Location: quechee Vermont
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whats the matter with the odometer?
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1998 ZJ 5.2 Auto

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Unread 02-02-2011, 04:33 PM   #5
SpideYJeep
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1992 YJ Wrangler 
 
Join Date: Jan 2010
Location: El Lay, TRIP!
Posts: 432
Quote:
Originally Posted by Mules50 View Post
Thats what I was thinking too. But the only requirement you need to follow the odometer is to have the odometer working correctly, which mine doesn't . I was thinking of just getting a Jerry Can and just getting some gas every couple of days or so.

If it was just the gauge, then I might replace but seeing as its probably the sending unit, inside the tank, then I prob not gonna worry bought it.
From what I've read recently, the things to do (simplest to most difficult) are:
1. Clean up the contacts at the gauge.
2. Confirm that the harness leading to the tank is connected above the tank (you may need to drop the tank to do so).
3. Sending unit - you've addressed that you're "not gonna worry" so I won't.
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Wrenching isn't the problem, it's the brains attached to the hands...unfortunately, I'm lacking some of the former so that's why I'm asking you guys!!

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My YJ is so excited it's leaking oil!
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Unread 02-02-2011, 05:57 PM   #6
kloppk
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1992 YJ Wrangler 
 
Join Date: Oct 2006
Location: , Massachusetts
Posts: 2,721
It may be the ground connection on top of the fuel pickup/level sensor assembly.
The ground is connected to a small metal tab.
Sand and mud builds up on top of the tank which cuases the tab to rust off cuasing teh level sensor to lose it's ground..

Could be the problem...
I've run into this issue on 2 different YJ's. Had to carefully tack weld the tab back on.
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Unread 05-07-2013, 09:34 AM   #7
krahnj
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1991 YJ Wrangler 
 
Join Date: Aug 2011
Location: greenwood, maine
Posts: 10
my problem is my odometer and spedo plus gas gauge doesnt work. gas gauge just stopped working the other day when i went wheeling. pretty sure it was because i hit a stump on the gas tank skid. usually when i hit bumps in the road it starts working again but this time its stuck at empty. i need ideas on what i can do to fix.
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Unread 05-14-2013, 09:16 AM   #8
daviddoughty1
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1987 YJ Wrangler 
 
Join Date: Apr 2011
Location: overbrook, ok
Posts: 36
Might check the connection between tub harness and fuel tank {left rear behind wheel well} Mine was loose at the plug and acted weird too
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Unread 05-14-2013, 10:46 AM   #9
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,608
Odod and speedo is either your cable or the gear on the tcase, its all mechanical. The fuel sender unit x2 with kloppk. Drop the tank and check the conector on the top. It sounds like its bad. You can short the sender wire to the guage to ground and if it goes to empty then it's time to drop the tank or cut the access hole to get at it.
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