In-tank gas sending unit removal question - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 12-03-2002, 08:34 PM
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In-tank gas sending unit removal question

My gas gauge on my '91 wrangler gauges decides when it wants to work and when it does'nt so I am going to replace the in tank pump to hopefully cure this problem. Does anyone have any advice on dropping the tank or anything else? It is an aftermarket steel 22 gallon tank with skid.
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post #2 of (permalink) Old 12-03-2002, 08:40 PM
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Re: In-tank gas sending unit removal question

i had to do that when the seal between my sender and the tank gave out. My recommendation would be to get as much gas as possible out of the tank to make things easier, not to mention safer. Then you can just drop it out of there just be mindful of the ground wires and lines and such. Make sure that you've narrowed it down to the sender though just to avoid all that labor and time.
post #3 of (permalink) Old 12-03-2002, 08:44 PM
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Re: In-tank gas sending unit removal question

What other things should i check to narrow it down?
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post #4 of (permalink) Old 12-03-2002, 09:44 PM
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Re: In-tank gas sending unit removal question

1. If it works some times and not other times... the chances are that the fuel sender is good.
2. That narrows down the problem to three areas:
a. The gague.
b. The harness from the tank to the gauge.
c. Grounds.
3. You've got to subistute a known resistance for the gague to simulate the sender. This way you can narrow down the problem.
4. Have you gone out to John Faust's Jeep® CJ Gauge & Sender Diagnostics page?
5. Read it over as lots of the information applies to YJ's. The write-up will help you to diagnois the problem.
6. Before I'd drop the tank I'd do the simple things like:
a. Check for continunity between the gauge and the tank harness.
b. Check for bad grounds (run a new ground).
c. Check the sender resistance value.. rock the Jeep a bit and see if the sender resistance moves.
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post #5 of (permalink) Old 12-03-2002, 10:31 PM
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Re: In-tank gas sending unit removal question

Yeah the gauge does move when the jeep is rocked. The thinks that make me think that it is not the gauge are that wrangler gauges are all wired together with this flat plastic thing and plugged into one plug. The gauge works sometimes like when the tank is all the way full, but if i run it low and then just put a few gallons in it does not register on the gauge. I accidentally ran the tank dry this last summer which could have damaged the pump/sender. And last of all I went wheeling this last weekend and the gauge was reading E when i had at least half a tank, and i slammed my tank on a rock and it read 1/2 full immediatly. Thanks for everyones help.
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