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Fires And Dies

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Peter Harman, Nov 7, 2018.

  1. Nov 7, 2018
    Peter Harman

    Peter Harman New Member

    Fountain CO
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    Feb 4, 2018
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    My ‘71 with factory Dauntless is giving me grief. I can’t get it to stay running. I have a new fuel pump, new plugs, new wires new coil, new cap/rotor/points. When it fires it runs for about 30 seconds and then dies, with or without choke/throttle. I know it’s got spark and fuel but otherwise I’m kinda stumped. Same problem persisted before I changed everything. When I first got the Jeep it fired up and ran great. This just started about a year ago after it sat for about 6 months. Any suggestions would be amazing.
     
  2. Nov 7, 2018
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    After it dies, immediately pull the top off the carb to see if it has fuel in the bowl.
     
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  3. Nov 7, 2018
    Vanguard

    Vanguard Tracer Bullet PI Staff Member Sponsor

    Brighton, MI USA
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    It does sound like a float problem. If the bowl is empty after the engine dies, the float is likely stuck.
     
    Last edited: Nov 7, 2018
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  4. Nov 7, 2018
    47v6

    47v6 junk wrecker! Sponsor

    Washington DC.
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    Fuel filter? I bet you already changed that though.
     
  5. Nov 7, 2018
    heavychevy

    heavychevy Sponsor Sponsor

    Danielsville georgia
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    Just because it has a new fuel pump, doesn't mean it is good. New parts today can be a problem.
     
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  6. Nov 7, 2018
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    replace the fuel filter again.
    When was the last time you cleaned the carb?
     
  7. Nov 7, 2018
    tarry99

    tarry99 Member Sponsor

    Northern California
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    Line to tank is partially clogged or dirt from the tank in the line................gas cap may not be vented......try taking it off or loosen it while running.
     
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  8. Nov 7, 2018
    timgr

    timgr Jeepin' Nerd Sponsor

    Medford Mass USA
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    Gravity feed (siphon) to the carb from a can on the cowl. It'll run like that, and test for blockage in the tank and lines. If you still have a problem, it's in the carburetor. Divide and conquer!
     
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  9. Nov 7, 2018
    Twin2

    Twin2 wasn't me Sponsor

    Virginia Beach, VA
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    if you find it's getting fuel . it might be electrical . these jeep had a ballast resistor before the coil
     
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  10. Nov 7, 2018
    timgr

    timgr Jeepin' Nerd Sponsor

    Medford Mass USA
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    You know how to hot wire a Jeep? Another easy test.
     
  11. Nov 7, 2018
    wheelie

    wheelie beeg dummy Sponsor

    York, PA
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    :watch:
     
  12. Nov 7, 2018
    PeteL

    PeteL Member Sponsor

    Hills of NH
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    x2. You say "30 seconds" but if it actually dies when you release the key from the 'crank' position, then it could be the ballast resistor.
     
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  13. Nov 8, 2018
    Rick Whitson

    Rick Whitson Sponsor Sponsor

    I live South of...
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    That's what I was thinking, ballast resistor. Maybe.
     
  14. Nov 8, 2018
    Walt Couch

    Walt Couch sidehill Cordele, Ga. Sponsor

    cordele, Ga.
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    Does it fire right back up after it dies?
     
  15. Nov 8, 2018
    sterlclan

    sterlclan Member Sponsor

    exploring the...
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    Fires while cranking the dies after release can be bad switch or broken wire.
     
  16. Nov 8, 2018
    Dauntless1971

    Dauntless1971 Member

    Bend, OR
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    Sounds a bit like clogged jets from our piss poor gasoline that turns to water after a period of time.
     
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  17. Nov 8, 2018
    jeep2003

    jeep2003 Active Member

    Vestal NY
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    yeah id say probably float stuck or just gunk floating around in there. Take the top of the carb off and clean it out its easy to do without pulling the whole thing off.
     
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  18. Nov 8, 2018
    PeteL

    PeteL Member Sponsor

    Hills of NH
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    SeaFoam often works wonders for carb crap.
     
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  19. Nov 9, 2018
    Peter Harman

    Peter Harman New Member

    Fountain CO
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    Update. Sorry it took so long. The last time it ran well was a few months back when I made my final attempt to drive it into the garage and it died. I put 5 gallons of gas in it but all it would do is start, run a bit and then die. This time I ran a hose from the fuel pump to a gas can and it fired right up, ran for about two minutes and died, then fired right back up but didn’t seem interested in staying running. So probably clogged lines to the tank or sludge in it. As for running and dying, I popped the top off the carb and the float bowl is full. It’s outside and has straight pipes coming out each side direct from the manifold with no mufflers, so it’s loud and I have cranky neighbors, so no more tonight. I did already replace the filter and I did the ballast resistor when I replaced all the wiring. Carb was cleaned completely about 3 months ago.
     
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  20. Nov 9, 2018
    PeteL

    PeteL Member Sponsor

    Hills of NH
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    I would check the plugs and see if they are sooty - maybe it is flooding out as it runs, possibly a leaky float valve in the carb.
     
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