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Cj5 Won't Start; Diagnosing Fuel Problem

Discussion in 'Early CJ5 and CJ6 Tech' started by twvancamp, Jul 5, 2024.

  1. Jul 9, 2024 at 10:49 AM
    twvancamp

    twvancamp Member 2024 Sponsor

    Floyd, VA
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    Jan 26, 2023
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    95
    I think it does, but some of it was exterior. Here is after cleaning the outside of the bowl:


    Still some crud at the bottom rim and maybe in the screen.
     
    Glenn likes this.
  2. Jul 9, 2024 at 10:50 AM
    twvancamp

    twvancamp Member 2024 Sponsor

    Floyd, VA
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    95
    That's great to know, thank you! I appreciate KW because they make the compatibility clear, but I agree the parts are not always great.
     
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  3. Jul 9, 2024 at 2:43 PM
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Okay good. BUT - does your coil throw an HT spark when you do that??? Place the output wire 1/4" from a ground to test this.
     
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  4. Jul 9, 2024 at 9:03 PM
    twvancamp

    twvancamp Member 2024 Sponsor

    Floyd, VA
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    I don't think the coil is giving a spark. Here is a video in case I'm doing the test incorrectly: https://www.youtube.com/shorts/5NFhy1YG7ss
     
    Glenn likes this.
  5. Jul 9, 2024 at 9:20 PM
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor

    East Tennessee
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    No spark, no starting. I think you are closing in on the problem.
     
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  6. Jul 9, 2024 at 9:22 PM
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Most carburetor problems are electrical. :whistle:
     
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  7. Jul 9, 2024 at 11:00 PM
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor

    East Tennessee
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    Yep. Especially when working on 2 cycle boat motors.
     
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  8. Jul 10, 2024 at 7:49 AM
    twvancamp

    twvancamp Member 2024 Sponsor

    Floyd, VA
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    Haha fair enough. Really appreciate you pointing me that way.

    Does this point to replacing the coil??
     
    Glenn likes this.
  9. Jul 10, 2024 at 8:54 AM
    jeepstar

    jeepstar Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sheboygan
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    Use a multimeter to test the coil

     
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  10. Jul 10, 2024 at 11:10 AM
    twvancamp

    twvancamp Member 2024 Sponsor

    Floyd, VA
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    Thank you— test showed 3.6 on the primary and 9.66k on the secondary. Seems like that's the correct resistance?

    I checked and cleaned the connections going to the coil and they looked okay.
     
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  11. Jul 10, 2024 at 4:14 PM
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Is the HT wire good? Solid wire is my preference but the carbon core supressor type can burn out.
     
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  12. Jul 10, 2024 at 6:00 PM
    Mr.T

    Mr.T New Member

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    Nov 13, 2007
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    Change the condenser, these things have a finite life and usually don’t last as long as the points and plugs.
    If you can find a new one buy two, even new ones are prone to be no good!
     
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  13. Jul 10, 2024 at 6:12 PM
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Maybe so. But even without a good condenser, wouldn't the coil be firing? Bad condenser will cause points to arc, and burn prematurely, but the OP just cleaned them.

    "Finite life?" I dunno, I've had many that lasted for decades.
     
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  14. Jul 10, 2024 at 6:57 PM
    twvancamp

    twvancamp Member 2024 Sponsor

    Floyd, VA
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    I think so. It's about 16" long and showed 9.16k ohms resistance. Here's a picture of the contacts:

     
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