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Unread 02-24-2009, 11:20 AM   #16
Levinz11
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Quote:
Originally Posted by rustywrangler View Post
Well then I guess the pump or connections at the pump are the next step. Sorry, was just trying to troubleshoot abit for ya.

Thats all I was looking for.

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Unread 02-24-2009, 11:48 AM   #17
azgurney
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When you say your fuel guage does not work do you mean it stays at empty or full? If it stays pegged out on full then you have a bad ground to the fuel pump and guage. They both use the same ground connected at the parking brake pedal mount bolt.
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Unread 02-24-2009, 11:50 AM   #18
Levinz11
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Originally Posted by azgurney View Post
When you say your fuel guage does not work do you mean it stays at empty or full? If it stays pegged out on full then you have a bad ground to the fuel pump and guage. They both use the same ground connected at the parking brake pedal mount bolt.
It stays at empty. Sometimes swinging over to 1/4 or 1/2 but never farther.

What does that mean? I always thought the sending unit was bad.
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Unread 02-24-2009, 11:56 AM   #19
veritas4156
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The sending unit uses a serious of strips of metal to ground the tank at different spots which put out different resistances, and something technical like that, blah blah blah, but what he was saying was that it still could have been a wiring issue but judging by your post it doesn't seem like it.


Just so you guys know, I don't really know how a sending unit works but that makes sense^^.
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Unread 02-24-2009, 11:58 AM   #20
heep1991
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Just a thought before dropping witch I have delt with and continue to deal with. I have 91 jeep and the fuel pump had a bad ground. I found this by using multimeter on the fuel pump plug witch you can access without dropping. Test both sides of the plug, I have to attach wire from plug that comes from fuel pump and ground it to my bumper. I will post pictures today of setup. Standby
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Unread 02-24-2009, 12:04 PM   #21
jeepster93
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I got the NAPA pump. It was about twice the size of the Bosch one.
When you have the tank dropped, get the sender working then.

Do you have a dent in the skid plate cover over the gas tank? That could cause the sender to get stuck on that baffle that is in the tank.

Here is a pic of my fuel pump/sender unit...
The actual "pump" is that aluminum looking cylinder. But what I got included in the box was all the parts it takes to remount the new pump into that harness it is in.




Here you can see the bulge in the baffle that is down inside the gas tank. Caused by a dent in the skid plate. It caused my sender to not work.

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Unread 02-24-2009, 12:13 PM   #22
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the above is a fairly common problem. this happened to me and over time messed everything up. ive done 2 pump replacements and never had a pump that was an identical match to the factory. always a bit of finagling to make it work. these were the ones napa had for my application a 91.
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Unread 02-24-2009, 12:52 PM   #23
Levinz11
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Quote:
Originally Posted by heep1991 View Post
Just a thought before dropping witch I have delt with and continue to deal with. I have 91 jeep and the fuel pump had a bad ground. I found this by using multimeter on the fuel pump plug witch you can access without dropping. Test both sides of the plug, I have to attach wire from plug that comes from fuel pump and ground it to my bumper. I will post pictures today of setup. Standby

How did you get to those without dropping the tank. Any pics would be great!
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Unread 02-24-2009, 01:17 PM   #24
rustywrangler
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Quote:
Originally Posted by Levinz11 View Post
How did you get to those without dropping the tank. Any pics would be great!
The plug pigtail should be accessable up infront of the tank. It is tight up there but doable from a creaper.
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Unread 02-24-2009, 01:50 PM   #25
Levinz11
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Quote:
Originally Posted by rustywrangler View Post
The plug pigtail should be accessable up infront of the tank. It is tight up there but doable from a creaper.
As soon as the boos leaves I'm heading out there to check these things out. Ground at the emergency brake bracket. Pigtail in front of tank. I didn't see it yesterday, but I'll look again.

Thanks again guys!
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Unread 02-24-2009, 06:51 PM   #26
heep1991
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Originally Posted by Levinz11 View Post
How did you get to those without dropping the tank. Any pics would be great!


Wire is long enough to reach tire well.


as you can see I removed insulation on ground wire and attached wire to ground to rear bumper.


wire running from fuel pump plug to bumper





Hope this helps dropping tank is pain. I've done it many times though
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Unread 02-24-2009, 06:52 PM   #27
heep1991
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Below is great way to test fuel pump and also get fuel to engine quick if you run outa gas or just need to fill lines. Remove cap from fuse and press the fuse together. Fuse is always power and you dont need key in or anything. FYI you can do this with all fuses.. to think about it probley do starter and fuel pump at same time and maybe start Jeep lol.





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Unread 02-24-2009, 08:43 PM   #28
Old4X
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Carter sells an inline pump that would work. I dispise dropping a tank to fix a FI fuel pump that goes out every 60,000 miles.
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Unread 02-25-2009, 10:34 AM   #29
Levinz11
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Quote:
Originally Posted by heep1991 View Post
Below is great way to test fuel pump and also get fuel to engine quick if you run outa gas or just need to fill lines. Remove cap from fuse and press the fuse together. Fuse is always power and you dont need key in or anything. FYI you can do this with all fuses.. to think about it probley do starter and fuel pump at same time and maybe start Jeep lol.





Could you explain this a lil better? Remove cap from fuse and push fuse together???
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Last edited by Levinz11; 02-25-2009 at 10:36 AM.. Reason: You mean the relay?
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Unread 02-25-2009, 10:36 AM   #30
Levinz11
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Quote:
Originally Posted by Old4X View Post
Carter sells an inline pump that would work. I dispise dropping a tank to fix a FI fuel pump that goes out every 60,000 miles.
So by installing an inline pump, the old one simply stays in the tank??
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