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Starts And Dies

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

  1. Feb 15, 2020
    nolehynaws

    nolehynaws Member

    Indiana
    Joined:
    Sep 4, 2018
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    77
    Yeah, I think it’s a fuel issue. But I took the top off of the carburetor and the needle doesn’t seem stuck, and I checked and gas is coming up from the pump. I’m clueless!
     
  2. Feb 15, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    Sep 4, 2018
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    77
    Okay, I’ll try that!
     
  3. Feb 15, 2020
    tcfeet

    tcfeet Member

    east of west,...
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    May 30, 2009
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    With the carb bowl full, look down the throat of the carb and pump the accelerator a couple of times.
    You should see gas spray each time. If not you need to soak and clean all passages and possibly
    replace the pump in carb.
     
  4. Feb 15, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Sep 21, 2002
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    Did the fuel bowl have gas in it? If so how much?
     
  5. Feb 15, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    So then, gas was coming out of the line at the carb?
     
  6. Feb 15, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    77
    Yes, it’s completely full.
     
  7. Feb 15, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    Sep 4, 2018
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    77
    Yep it was squirting out. I just took the carb off, darn thing:mad:
     
  8. Feb 15, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    Sep 4, 2018
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    77
    Okay! It’s off right now so I’ll do that for sure.
     
  9. Feb 15, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Full as in all the way to the top? If so it is probably flooding out and dying because of that. Of course since you say it will start if you put gas in the carb it probably isn't flooding. Is your carb a Carter YF?
     
    Last edited: Feb 15, 2020
  10. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    Yes, it is. And sorry I think I misunderstood, it was about half way up when I took it off I believe.
     
  11. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Certainly should run and stay running with that amount of fuel then.
     
  12. Feb 16, 2020
    NCRenII

    NCRenII yellow fever

    Far Nor Cal
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    Sep 22, 2017
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    424
    Realize the focus is fuel I'd also check to be sure the vacuum lines are all fitted tightly and the carb to intake gasket is holding tight.
    One other elect item to check is the ignition switch it-self. On older vehicles bad contacts or crud can cause cutting out as the engine starts and the switch transitions from start to run contacts. A quick verification can be done by keeping fingers on key and as it starts rotate key to the run position and wiggle it slightly.
    Testing the run contact can also be done with a test light or ohm meter as well without the engine going through the start and run positions.
     
  13. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    If you're working on the carb are you following the FSM?
     
  14. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    Yes. I didn’t really change anything, the float is set correctly I believe and I just sprayed it down with carb cleaner and let it sit.
     
  15. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    Okay! I’ll try that. But yeah I think it’s fuel since it’ll run when someone’s pouring it down the throat.
     
  16. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    I would think so! There’s fuel in the tank, fuel in the pump, fuel in the carb, and it still won’t run. I’m completely lost.
     
  17. Feb 16, 2020
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
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    Well, that is important information, which I don't think we had before.

    Is it possible you have a vacuum leak? Carb gasket?

    And "fuel in the carb" is no guarantee of anything, if the fuel/air mix is not correct - for instance if the float level is incorrect.

    Any diagnosis needs to be logic-driven, and that is futile until all tune up specifications are first known to be correct.
     
  18. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Fuel in the carb doesn't mean it will run, but it rules out the question of "is fuel getting to the carb". One less hurdle.
     
  19. Feb 16, 2020
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Please describe exactly how it runs....good, smooth, misses, rough, backfires? Can you control it with the throttle? Will it rev? Will it idle? If it sits for hours have you been able to start it normally? Do you use the choke?
     
  20. Feb 16, 2020
    nolehynaws

    nolehynaws Member

    Indiana
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    I don’t think that there is a vacuum leak. It’s a pretty new gasket. I have the oil bath air cleaner off so none of the hoses are hooked up, but that wouldn’t cause a vacuum leak would it?
     

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