1. #1
    tailights24's Avatar
    tailights24 is offline Junior Member
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    Feb 2008
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    power to the yj fuel pump question

    1993 wrangler 4.2 / 4.0 conversion. trying to trouble shoot the wiring for the fuel pump. ignition to on, fuel pump runs for a second or two. unplug the crank sensor and plug back in, fuel pump runs for a second or two. unplug distrubutor and plug back in, fuel pump runs for a second or two.
    fuel pump will not run while motor is turning over. checked fuel pump relay, and shut down relay, am i over looking something?

  2. #2
    superj's Avatar
    superj is offline Senior Member
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    Re: power to the yj fuel pump question

    You hooked everything back uo exactly in your engine conversion?

    Which engine did you swap to? A 4.0 or 4.2 and from what did you have originally?

    My 87 is a 4.2 and the wife's ex 93 was a 4.0 is why I am asking the particulars on your motor swap. you obviously stayed with the fuel injection so your wiring should be totally stock, right
    no more jeeps at this time. next time it will be a cj with a v8

  3. #3
    jps4jeep's Avatar
    jps4jeep is offline Moderator
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    Re: power to the yj fuel pump question

    unclear as to what your swapping, a 93 YJ would have had a 4.0 stock..

    regardless, are you checking the lines for pressure, just because the pump makes a sound,doesn't mean it is resurizing the line. the pump has a small hose inside that connects the pump to the diaphram, they have been known to come off quite easily. I suggest relieving the fuel line pressure, put a guage on the shrader valve, checking the line for ignition, and starting conditions.
    It used to be a jeep Thing,
    But all that stuff broke

    -Johnny-


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