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Starts And Dies

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

  1. nolehynaws

    nolehynaws Member

    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. nolehynaws

    nolehynaws Member

    Okay, I’ll try that!
     
  3. tcfeet

    tcfeet Member

    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. Glenn

    Glenn Kinda grumpy old man Staff Member

    Did the fuel bowl have gas in it? If so how much?
     
  5. Glenn

    Glenn Kinda grumpy old man Staff Member

    So then, gas was coming out of the line at the carb?
     
  6. nolehynaws

    nolehynaws Member

    Yes, it’s completely full.
     
  7. nolehynaws

    nolehynaws Member

    Yep it was squirting out. I just took the carb off, darn thing:mad:
     
  8. nolehynaws

    nolehynaws Member

    Okay! It’s off right now so I’ll do that for sure.
     
  9. Glenn

    Glenn Kinda grumpy old man Staff Member

    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. nolehynaws

    nolehynaws Member

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

    Glenn Kinda grumpy old man Staff Member

    Certainly should run and stay running with that amount of fuel then.
     
  12. NCRenII

    NCRenII yellow fever

    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. Glenn

    Glenn Kinda grumpy old man Staff Member

    If you're working on the carb are you following the FSM?
     
  14. nolehynaws

    nolehynaws Member

    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. nolehynaws

    nolehynaws Member

    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. nolehynaws

    nolehynaws Member

    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. PeteL

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

    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. Glenn

    Glenn Kinda grumpy old man Staff Member

    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. Glenn

    Glenn Kinda grumpy old man Staff Member

    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. nolehynaws

    nolehynaws Member

    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?