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Carburetor, Fuel Pump, Timing, Or Other

Discussion in 'Early CJ-5 and CJ-6 Tech' started by johnsotd, Jan 13, 2017.

  1. Jan 13, 2017
    johnsotd

    johnsotd Member

    Senatobia, MS
    Joined:
    Apr 23, 2006
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    454
    62 cj5 f 134 new build. Went for a short drive yesterday to put a couple of miles on my Jeep and to get some gas. I went through the neighborhood because I don't yet have a title.
    The motor ran great on open stretches but went dead at every stop finally not starting for an extended period. After much effort it restarted and got me home where it died while idling. I have the fuel pump with the glass bowl and vacuum pump which is plugged off. I can see gas moving at idle and the bowl is full at speed. I have cleaned the carburetor twice. Could this be a timing issue? I have never found the timing mark? (I know where it is supposed to be).
    As usual, I appreciate your help.
     
  2. Jan 13, 2017
    jeepstar

    jeepstar Member

    Sheboygan
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    Jun 28, 2006
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    575
    Maybe points in the distributor? Or timing.
    Try to change all the fuel and fuel filter.
    My timing mark on the pulley was very faint. I had to lay underneath it with my surfire light to se the notch. Once i found it, i painted it white with the wifes nail polish.
     
  3. Jan 13, 2017
    PeteL

    PeteL Member Sponsor

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    Could be timing/points. But also sounds a lot like flooding/over-rich mix. Takes it at open throttle. but too much gas at idle - and that would indeed make it hard to restart.

    BUT you should always have your points and timing set to spec as the basic beginning of ANY tune-up or diagnosis. Takes maybe 15 minutes. Otherwise you'll be going in circles fixing things that ain't broke, which will then mess up what was good to begin with.

    How to Tune Up Your Car

    This is basic FSM Chapter One stuff, but apparently that knowledge died with the dinosaurs.
     
    Last edited: Jan 13, 2017
  4. Jan 14, 2017
    johnsotd

    johnsotd Member

    Senatobia, MS
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    I have rebuilt the carb at least twice with no improvement. I have looked until my eyes hurt for the hidden timing mark but try once again.
    Thanks for the advice.
     
  5. Jan 14, 2017
    ITLKSEZ

    ITLKSEZ Time, or money, but never both.

    Post Falls, ID
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    After having a faulty condenser recently, that is the first place I now look for mystery problems. It can really show up as odd symptoms. They're cheap and easy to swap out, just to rule out if nothing else.
     
  6. Jan 14, 2017
    Daryl

    Daryl Sponsor Sponsor

    Bonney Lake, WA
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    Could also be a vacuum leak. Check that the carb is tight on a good gasket.
     
  7. Jan 14, 2017
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Yep, a vacuum leak can definitely mess with you. I think I remember someone else having that same problem and found out the carb was loose.
     
  8. Feb 14, 2017
    johnsotd

    johnsotd Member

    Senatobia, MS
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    I have been working on this off and on since my last post. I think timing is OK Found TDC. I checked for a vacuum leak with brake cleaner the last time it ran and found no issues.
    Today I took the top of the carburetor off to check the float and it looks like it is set right,....BUT..... the bowl is bone dry. What could cause this????
    Thanks
     
  9. Feb 14, 2017
    PeteL

    PeteL Member Sponsor

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    I'm surprised there would not be some residual gas in the bowl. Is it possible the accelerator pump diaphragm is leaking, despite your two carb "cleanings?" That could explain it dying at idle, also.

    Otherwise, I guess it is time to check the output from your fuel pump, although you said you have fuel reaching the pump bowl.

    Disconnect the fuel line at the carb, check the pressure with the line capped while cranking - should be 3psi or slightly more.
    Then also check output volume. With no restriction, the line should flow the equivalent of one quart per minute "at idle speed" per FSM.
     
  10. Feb 14, 2017
    johnsotd

    johnsotd Member

    Senatobia, MS
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    The fuel pump is pumping fuel although I don't know the volume or pressure but it looks like it should be adequate. I did have an accelerator pump diaphragm on another build that was ruined by ethanol gas. I will check this one carefully.
    Thank you
     
  11. Feb 15, 2017
    garage gnome

    garage gnome Flat fender guy Sponsor

    Western MA
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  12. Feb 15, 2017
    scoutpilot

    scoutpilot Sponsor Sponsor

    Asheboro, NC
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    Who rebuilt it? Has this motor been properly broken in? “It looks ok” doesn’t mean anything. Got some numbers?
     
  13. Feb 15, 2017
    ETZFAM

    ETZFAM FLATIES & ROUND FENDERS, SOME EVEN RUN

    WENATCHEE, WA
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    As mentioned before, those fuel pumps with the glass bowls, the gaskets for them are not what they use to be, a small leak there and intermittent problems?

    Rick
     
  14. Feb 15, 2017
    johnsotd

    johnsotd Member

    Senatobia, MS
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    I don't know how to check the fuel pump other than to see if it is pumping.
    Can the fuel pump siphon fuel back out of the carb. when the motor is off.
    I rebuilt this carb. and payed close attention to the directions but maybe I missed something.
    I'll do it again.
     
  15. Feb 15, 2017
    garage gnome

    garage gnome Flat fender guy Sponsor

    Western MA
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    Thats exactly what my jeep was doing. I put a good carter pump from rock auto in and problem went away.
     

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