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Old 07-26-2011, 10:07 PM
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1991 yj

i have a 1991 yj with 4.0 and 5 speed, this is my first jeep, i have a starting problem, no fuel, at first, when i turned the key on the fuel pump would cycle and it would start and runfor about 5 to 10 sec if i featherd the throttle, now it will not do anything, the fuel pump will not cycle at all, the fuel pump fuse is good, the relay will click when key is turned on, and if i pull the relay i have power and i can run ajumper and the fuel pump will run .any ideas?where do i start

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Old 07-27-2011, 07:55 PM   #2
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sounds like the relay is bad if you have voltage to the relay and the pump runs when relay is bypassed .
does the motor run when you use the jumper?

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Old 07-27-2011, 07:58 PM   #3
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sounds like the relay is bad if you have voltage to the relay and the pump runs when relay is bypassed .
does the motor run when you use the jumper?
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Old 07-28-2011, 01:32 PM   #4
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Try swaping relays, most if not all the relays should be the same.
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Old 07-29-2011, 11:26 AM
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i switched relays the fuel system primed(the pump ran for a second)the jeep started and ran for about 20 seconds with me feathering the throttle. then it died like it ran out of fuel,,, could it be the crank sensor? i did a resistance test on it and there is no reading,
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