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Thread: Crank But No start

  1. #1
    Caught the Bug Rubi_the_jeep's Avatar
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    Crank But No start

    Hey guys i have run into a problem with my 2000 4.0L TJ. I was off roading with my buddies and the jeep was working perfectly fine. We even stopped at a spot I turn the Jeep off, and went to start it back up and it started fine. Then we got to our campsite. And I turned it off and played music from the jeep while in accessory. But then about 30 minutes later I went back to start the jeep and it just kept cranking. Not starting. I had plenty of volts from the battery, and I did not seem like it was not getting fuel. I happen to have a fuel pressure gauge and I checked the pressure and I was not getting any fuel pressure when trying to start. So we towed it back home and put a new fuel pump on it. And it still cranks but does not start. Replaced the spark plugs, and that did nothing. It’s not the ECU because I had another one lying around that still worked I put that on the jeep and it still does not start. Any help is appreciated thank you very much!!


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  2. #2
    Knows a Thing or Two 19YJ94's Avatar
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    Did you change the fuel filter? Check all the wire connections, grounds, ect?

  3. #3
    Caught the Bug Rubi_the_jeep's Avatar
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    The fuel filter is attached to the Bottom of the fuel pump correct?


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  4. #4
    Meme King WJCO's Avatar
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    Make sure pump is getting power and ground. You will only have power there for about 3 seconds. Once the system pressurizes, power signal goes away. Swapping the relay is a quick check too.
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  5. #5
    Nothing but a Thing Zstairlessone's Avatar
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    Sure you have gas?


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  6. #6
    Addict jesse3638's Avatar
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    Did the TJ have the same security system issues the XJ did?

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  7. #7
    Knows a Thing or Two 19YJ94's Avatar
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    Quote Originally Posted by Rubi_the_jeep View Post
    The fuel filter is attached to the Bottom of the fuel pump correct?


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    Yeah I believe your right, I was thinking of my YJ 4.0.

  8. #8
    Caught the Bug Rubi_the_jeep's Avatar
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    Quote Originally Posted by WJCO View Post
    Make sure pump is getting power and ground. You will only have power there for about 3 seconds. Once the system pressurizes, power signal goes away. Swapping the relay is a quick check too.
    Yeah i hear the pump coming on when i first turn the key to accessory. I’ll try switching the relay

  9. #9
    Caught the Bug Rubi_the_jeep's Avatar
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    Quote Originally Posted by Zstairlessone View Post
    Sure you have gas?


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    Yeah i have a break in the fuel line and it is definitely pressurized

  10. #10
    Hooked PT1400's Avatar
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    You said you had plenty of volts but what were the volts while cranking? The PCM shuts down below 9.6 volts.

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