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Old 07-09-2008, 11:34 AM
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Cool YJ Electric fuel pump experience needed

I have a 93 base YJ, manual trans 4.0 that is getting no fuel pressure at the rail. I have 12vdc at the fuel pump relay and it is switching just fine. I used clip leads to hook it up separate from the PDC and got 12vdc out of it.

The FSM electrical manual shows an indication of a black connector at the right rear of the engine that carries the voltage to the pump but I haven't been able to locate it. It doesn't indicate either high or low behind the engine but I didn't see any connector either place.

I want to check voltage at the pump first without dropping the tank but cannot figure out how to get to the connector, short of either dropping the tank or cutting an access hole in the rear tub floor.

I have read a few mentions of folks who apparently have gotten to the tank connector but it is not clear if they dropped, or partially dropped the tank or were able somehow to reach it with the tank in place..

If there isn't any other way I will drop the tank but just am curious if I have missed anything that would make it easier?

Tnx Fred in Mesquite, TX
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Old 07-09-2008, 06:33 PM   #2
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I thought all YJ's had the external fuel pumps on the frame, just up from the tank? First thing I'd check would be fuel filter though which I also thought was on the frame.

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Old 07-09-2008, 07:29 PM   #3
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the fuel pump is in the tank!!! there is a connector right ontop of it you can get to with your hand, there are three wires in it( i think) so remember, driver side rear under the bumper ontop of the tank, trace the wires coming out of the tank, you will find the connector and dissconnect it and the check there, if its fine, the fuel filter is on the drivers side frame rught infornt of the wheel. no that, check your fuel pressure reguator up at the rail. its vacume operated so check for leaks. good luck got any more questions?
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