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Fuel delivery problem, I think

Discussion in 'Early CJ5 and CJ6 Tech' started by liquids, May 1, 2008.

  1. May 1, 2008
    liquids

    liquids Old Member

    Detroit-ish
    Joined:
    Apr 15, 2008
    Messages:
    51
    Working on the '68 V-6 over the weekend, we were never able to get it running for longer than a minute. After a couple pumps of the gas pedal and choke open, it would fire up and run normal for a few seconds, then fall back to just sputtering, then rev up to fast idle again, then sputter, over and over again. Often would stall during the sputtering part.

    We replaced the original gas tank with an MTS plastic one the last time we worked on it and it ran that weekend without a problem.

    I'm thinking it's acting like there's a vacuum in the tank. Buddy thinks that we may have ignored the placement of the tubes in the tank during fuel pickup install when we did the tank. We didn't come up with these theories until after we left, so we couldn't test them.

    Either of those sound right, or do y'all think it's something else still?
     
  2. May 1, 2008
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2021 Sponsor 2020 Sponsor

    cordele, Ga.
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    Mar 29, 2007
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    5,660
    Do you have a see-thru fuel filter that you might be seeing bubbles in the fuel. That would tell you if pick-up tube, etc is bad?
     
  3. May 1, 2008
    liquids

    liquids Old Member

    Detroit-ish
    Joined:
    Apr 15, 2008
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    51
    Too dirty to tell if it's see-through right now, but I'll check that. Thanks.
     
  4. May 1, 2008
    mortten

    mortten I can’t put my finger on it 2021 Sponsor 2020 Sponsor

    Peninsula, Ohio
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    Apr 17, 2006
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    1,578
    Originally these came with a return line from the fuel pump to the tank. According to the FSM this was to prevent vapor lock. I had issues with mine with the port on the pump plugged. I ran a return line and solved the problem. Others have not had a problem with the line plugged. Also check the vent in the gas cap. I had those issues on my motorcycle. Wax had plugged up the vent hole.
     
  5. May 3, 2008
    wrenchbender1

    wrenchbender1 New Member

    Joined:
    Apr 23, 2007
    Messages:
    20
    I had the same problem with mine when I first bought it. Apparently, the orange rtv that was on the sending unit gasket turned into jello when exposed to fuel which then clogged the fuel line.
     
  6. May 3, 2008
    Dan66cj5

    Dan66cj5 Member

    Oregon
    Joined:
    Feb 20, 2003
    Messages:
    235
    Sounds like how my jeep acted once when I was trying to get it started.. then, I tried starting it with the choke on(butterfly closed), and it started up and ran good :) I guess I thought I could start it and keep it running with the choke open by just feathering the throttle.
     

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