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Ok, I Am Officially Getting Tired Of This Crap

Discussion in 'Early CJ5 and CJ6 Tech' started by mickeykelley, Nov 3, 2021.

  1. Nov 4, 2021
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I suggest trying Sea Foam if you can find it. The crappy gas sitting may very well be your problem. I'm thinking the check valves in your fuel pump are sticking due to getting gunked up. Sea Foam made a major difference in my stuff.
     
    Ol Fogie and PeteL like this.
  2. Nov 4, 2021
    GillaFunk

    GillaFunk I'm the Dude, so thats what you call me. 2022 Sponsor

    Graeagle Calif...
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    So while my situation is different I do live at 5000 to and have gone up to 7,000 feet. here are my experiences:

    Engine has been completely rebuilt from the ground up by Jimmy Strauss. The carburetor is a weber two barrel. The exhaust system is Clifford. Jetting originally is stock From Weber. Even with running ridiculously rich, at 7,000 feet, my spark plugs being wet, having to use the silly nonsense green fuel California residents are told to use , I have never experienced any of the symptoms as described in the original post. Now having re-jetted the engine I can tell you the jeep runs substantially better now.

    You have some kind of fuel delivery issue.
     
    Last edited: Nov 4, 2021
  3. Nov 4, 2021
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Hills of NH
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    Ditto on Seafoam. "It's good for what ails you."

    And also - when I had very similar trouble it was a clogged fuel filter, which only acted up when climbing hills. A failing fuel pump can do the same.
     
    Lockman likes this.
  4. Nov 4, 2021
    Lockman

    Lockman OK.....Now I Get It . 2022 Sponsor 2021 Sponsor 2020 Sponsor

    White City, NY 14617
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    You need the new jets , for the altitude. Then you Tune to that . Basic fuel filter & fuel line check , too.
     
    Last edited: Nov 4, 2021
    Rick Whitson likes this.
  5. Nov 4, 2021
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Medford Mass USA
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    Possible the difference is the change in terrain, not the altitude? If so, you'd only see fuel starvation when you need constant extra throttle for a long time, like on long hills.
     
  6. Nov 4, 2021
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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    The fuel was not very old in the tank but who knows how long sitting at the station. Not likely long as the stations I use are pretty busy, but who knows. I’ve used SeaFoam before but haven’t lately, so I’ll stick a can of it in the tank. The way it acted was classic vapor lock even though the temps were not high. I’ve got rods for altitude and of course forgot to bring them. Next trip along with the NOS AC pump. But I’m thinking the rods would be an all the time issue, not a running fine, then cut out, wait 5 and then it goes again. The more I think about this, the more I’m coming back to vapor lock and adding an electric pump to supplement.
     
    Jw60 likes this.
  7. Nov 4, 2021
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Post Falls, ID
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    A jetting issue would cause it to run more rich at altitude. That would cause a stumbling issue combined with a very rich-smelling exhaust. It’s highly unlikely that it would cause the engine to just quit.

    I agree that it could be a failing fuel pump, but the fact that it repeats the symptoms during its yearly trip lends me to shy away from that. A pump usually doesn’t die over the course of years. And if it is just a weak pump, the weak fuel pressure could also be lending itself to the ultimate issue… vapor lock.

    Check all your fuel lines’ proximity to exhaust components; especially on the ‘suction’ side of the system. A simple heat shield could fix this.

    So what did you think it is?
    Edit: you just answered that. :D
     
    Glenn likes this.
  8. Nov 4, 2021
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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    Vapor locking.
     
    ITLKSEZ likes this.
  9. Nov 4, 2021
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Adding the back up fuel pump is certainly a good idea. Hopefully you can figure out the true problem also.
     
  10. Nov 4, 2021
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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    Going back on my memory, I got several custom rods for altitude made for me a couple years back in anticipation of this move to altitude since the game plan is to leave Willie up at the cabin. As I remember the story, The Carburetor Shop had purchased all the stock, etc., years ago and had the machines to create these rods. That is part of the final solution, but I don’t think that has any thing to do with this cut out, wait 5 and go.
     
  11. Nov 4, 2021
    achuto

    achuto CJ5/LJ/WK2 2022 Sponsor 2020 Sponsor

    Fallbrook,...
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    I've been having the same issue with my dauntless, drive it around just fine then bam! Stops running like it ran out of gas, wait a minute or three and off she goes. Just got done emptying/cleaning gas tank, new fuel filter(s), electric fuel pump, new fuel line. Ran great for a day then bam! Next step is having the carb rebuilt.
    Some have suggested it might be an electrical issue, maybe a bad coil. Process of elimination I guess. I'll be following along on this thread to find the outcome. Been told that a rubber fuel can deteriorate from inside and have a hanging flap that drops preventing gas getting to the carb.
     
    Glenn likes this.
  12. Nov 4, 2021
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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    I do have to add, that driving Willie up here in the crisp cold air, with tall pine trees and the windshield down, is very relaxing. I just have to stay close to the cabin until I get this solved.
     
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  13. Nov 4, 2021
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I can't think of anything more peaceful, more relaxing than putting along a woods road in a Jeep. :)
     
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  14. Nov 4, 2021
    hooliganrick

    hooliganrick Sponsor

    San Diego, CA
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    i had the same issue, only with my v6. i remedied the problem by installing a fuel pump with the return line to the tank. PO had the wrong one. i also installed a heat shield to protect the pump from the close proximity to the exhaust. Another item that a PO forgot. no troubles since. heat and high altitude are a bad combo. vapor lock. good luck with it.
     
  15. Nov 4, 2021
    Boyink

    Boyink Super Moderator Staff Member

    Ava, MO
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    Only other thing I've had that led to similar results was a fuel cap that didn't vent. Jeep would stall, I'd go unseat the gas cap and hear air getting sucked into the tank.
     
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  16. Nov 4, 2021
    duffer

    duffer Rodent Power

    Bozeman, MT
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    Yep. Possibly a restricted fuel pickup (clogged), pinched fuel line, or the fuel pump. They usually run just fine at high altitude without changing jets.
     
  17. Nov 4, 2021
    Lockman

    Lockman OK.....Now I Get It . 2022 Sponsor 2021 Sponsor 2020 Sponsor

    White City, NY 14617
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    He does state that the change in Elevation is when he started experiencing this problem, though . :confused:
     
  18. Nov 4, 2021
    Jw60

    Jw60 WRPD855 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    he makes this move every year so we must look at what changed from last year. So rods and jets are out since they don't wear aside from grime buildup.
     
  19. Nov 4, 2021
    jeep2003

    jeep2003 Well-Known Member

    Upstate NY
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    Every september stations switch to winter blend fuel which is cheaper (for them) but its worse for us. It evaporates easier and boils easier. I wouldnt be surprised if they made it much worse this year. Alot of people seem to have this problem this year. Iv had it happen on my neighbors mower. All summer it was fine. The beginning of october he had problems so i had him run without the hood sides to let the heat out and its been fine.
     
  20. Nov 5, 2021
    Lockman

    Lockman OK.....Now I Get It . 2022 Sponsor 2021 Sponsor 2020 Sponsor

    White City, NY 14617
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    I hope he let's us know when he solves it ? :waiting:
     
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