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Starts And Dies

Discussion in 'Early CJ5 and CJ6 Tech' started by nolehynaws, Feb 9, 2020.

  1. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    I hope that link works, it should be a video of it starting up. All I did here was put a little gas in the carb and then run the fuel pump directly into a cup of gas. No choke or anything. I revved it up a few times, which is what you can hear, and then it just dies on it’s own.
     
  2. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    Also, just for more info, when it used to run it always needed fuel in the carb to start for the first time that day.
     
  3. Feb 16, 2020
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
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    After seeing your video, I agree it is apparently a fuel issue.

    Since this problem appeared right after you "cleaned" the carb, I'd say something happened then. Something misplaced or mis-adjusted?

    Sounds as if it is not getting any go-juice from the carb. Is your choke working, and fully closed when starting?

    There is also a port or vacuum line on the head directly below the carb, into the intake manifold. Also, YF carbs can sometimes develop an air leak even with a new gasket, if the mounting nuts are over-torqued and the base flange gets warped.

    I assume your 'new' gasket had the appropriate X-channels cut in it for the internal vacuum passage.

    s-l1600.jpg
     
    Last edited: Feb 16, 2020
  4. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    You mean the suction or discharge.
     
  5. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Accelerator pump appears to be working, no doubt sounds like it's starving for fuel though.
     
  6. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    Yes, the new gasket has that x in it. Should I go ahead and order a new gasket? Maybe that’ll do it, or at least we can rule it out.
     
    Glenn likes this.
  7. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    The suction. The pump is sucking from a cup of gas, just so I know it’s not the filter restricting anything.
     
    Glenn likes this.
  8. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    Anything I should check first? The bowl is full whenever I take the top of the carburetor off, so I just have no idea what could be causing it.
     
  9. Feb 16, 2020
    NCRenII

    NCRenII yellow fever

    Far Nor Cal
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    o.k. fuel in bowl. Elect ruled out. Runs while 'pumping'. That says there is sufficient fuel in bowl to reach accel pump.
    I'd concentrate on the idle circuit. While unfamiliar with the carb you are working with I'd make sure gaskets are oriented properly and the circuits are all clear. Blow air through passages and also pass a small wire into openings. Wire should be similar diameter to a wire brush. That is where I source my carb passage cleaners.
    Also, when setting up the needle valves turn them in until gently seated and back out 1 to 1-1/4 turns out.
    p.s. with top off carb fuel is not full to the top is it? It should be down a quarter to half inch depending on carb. Also, is the float brass or plastic, does it contain fuel?
     
    Last edited: Feb 17, 2020
  10. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Have you ever put a rebuild kit in it? I'm puzzled as to why it quits. Also why you had to put gas in every time previously. Did you pour the gas in directly like now but it did stay running before?
     
  11. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Is the throttle plate shaft loose? Can you wiggle it noticeably?
     
  12. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    When I had it off, I checked the gaskets and stuck some wire in the passages. And I believe that I set that up right, but I'll double check, thanks for the reminder!
     
  13. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    When my grandpa had it he gave it to someone who rebuilt it, that was about a year ago. And yes if it was sitting for a while you had to put some gas directly in the carb and then it would start up and run normally. I don't know exactly why this happened, I didn't mind it too much but it is puzzling :shrug:
     
  14. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    What is the throttle plate shaft? I can't find it in the manual.
     
  15. Feb 16, 2020
    Fireball

    Fireball Member 2020 Sponsor 2019 Sponsor

    Pullman, WA
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    Did the idle screw(s) get turned when you cleaned the carb. I'm not familiar with the 1bl Jeep barbs, but typically you run them all the way in and them back 2 to 2.5 turns to get something that runs.
     
  16. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    It's at the very bottom, it's what the linkage attaches to. The throttle plate is attached to it.

    I should say near the bottom.
     
    Last edited: Feb 16, 2020
  17. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    If the shaft is loose enough it causes a vacuum leak, which if bad enough it won't idle. It should still run though with throttle.
     
  18. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    The service manual says 3/4 to 1 3/4 for this one, it's somewhere in that range right now.
     
  19. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    No, I don't think that that is loose. I can check next time i'm there but it doesn't run even with throttle, so if that's the case maybe it's not that.
     
  20. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I don't think it is the problem either, just throwing that out there. Has your distributor got points and condenser?
     

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