1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Need Advice - Carter Carb Flooding Problem

Discussion in 'Early CJ5 and CJ6 Tech' started by Mark Zanoni, Jul 15, 2024.

  1. Jul 19, 2024
    Jw60

    Jw60 New Member 2025 Sponsor 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Trails end,...
    Joined:
    Apr 8, 2008
    Messages:
    5,957
    Not necessarily.
    Don't get worked up on how the numbers are calculated. that's my job (in a different application), just trust the numbers.

    It's like sizing an air compressor.
    A paint gun is different from an impact is different from 4 or 6.
    The float bowl is a storage tank at the tool. Yes... but the tool needs a compressor that can keep up at pressure after the run of hose to the tool under all loads and environmental conditions.

    Too low volume or high or low pressure and your paint won't spray the same.
     
    Last edited: Jul 19, 2024
    dozerjim and Glenn like this.
  2. Jul 23, 2024
    Mark Zanoni

    Mark Zanoni New Member

    Cincinnati, OH
    Joined:
    Mar 26, 2021
    Messages:
    48
    Update: I removed the top of the carb and used compressed air to blow out all the fuel passages. After installing the new fuel pump I should have anticipated there might be foreign material in the NOS pump and should have flushed it first. I then installed a 0 - 10psi pressure gauge on the inlet to the carb and cranked the engine several times. Initially the pressure was about 2-1/2 psi as the bowl was filling (seems correct). After two more 15-sec cranks of engine (it didn't start), pressure climbed to 7 psi, then 9-1/2 psi indicating to me the bowl was full and needle valve closed. Let me know if you think my analysis on this is correct. Btw that handy brake line T-fitting came from NAPA, along with the two reducers to get up to 1/4" NPT. Next up is volumetric test.
     
    scoutpilot, dozerjim, Glenn and 2 others like this.
  3. Jul 28, 2024
    Mark Zanoni

    Mark Zanoni New Member

    Cincinnati, OH
    Joined:
    Mar 26, 2021
    Messages:
    48
    Update: So fuel problem seems to be resolved but now engine not getting any spark. While troubleshooting that issue I discovered the bolt holding the generator bracket to the block fell out (which probably explains why my battery died). Now it looks like as it was rattling it's way out of the block the old bolt damaged the threads and I'm going to have to install a helicoil. Is this the part where the Jeepin gets fun?
     
  4. Jul 28, 2024
    PeteL

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

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    10,451
    First try running a tap into the hole to clean the threads, and using a longer bolt if you can.
     
  5. Jul 28, 2024
    PeteL

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

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    10,451
    Initially the pressure was about 2-1/2 psi as the bowl was filling (seems correct)

    No - that is NOT correct. You need to understand the difference between "Residual Pressure" in an open (dynamic) flow, and "Static Pressure" in a closed system.


    That 'static pressure' seems to be much too high. The factory specification is that it should be in the neighborhood of 3psi.

    How
    did you "resolve" the fuel issue?
     
    Last edited: Jul 29, 2024
    dozerjim, vtxtasy and Glenn like this.
  6. Jul 28, 2024
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    24,166
    These carburetors will run on minimal pressure. You might try putting a gas can on the cowl and running the carb from a siphon. It will work and be a good test. You don't want more than a few psi of pressure.

    Don't know if this is a particualr issue with the BBD, but did you adjust the float? The float tang operating on the needle valve needs to be perfectly perpendicular to the needle. Any angle of bend other than up down might hang.
     
    Last edited: Jul 28, 2024
    dozerjim, vtxtasy, Glenn and 2 others like this.
  7. Jul 29, 2024
    Mark Zanoni

    Mark Zanoni New Member

    Cincinnati, OH
    Joined:
    Mar 26, 2021
    Messages:
    48
    I'm not sure I mentioned this earlier but I'm not the smartest Jeeper out there. After reviewing some of the comments regarding my generator bracket dilima, I broke out a flashlight and examined the problem in more detail. Turns out the "block" end of the bracket actually bolts to another bracket on the block with a nut and not directly to the block. So that problem is solved. Also I diagnosed my ignition problem to a bad coil. Has anyone ever killed a coil by leaving the ignition on and draining the battery?
     
    vtxtasy and Glenn like this.
  8. Jul 29, 2024
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    24,166
    Coils will fail and leave you stranded. BTDT. Jeepers should carry a spare coil.

    Yes, the coil will get hot and could fail if you leave the key on.
     
    vtxtasy and Glenn like this.
  9. Jul 29, 2024
    amboynut

    amboynut Member

    Chelatchie, WA
    Joined:
    Aug 25, 2021
    Messages:
    370
    … and the points are closed.
     
    vtxtasy and Glenn like this.
  10. Sep 1, 2024
    Mark Zanoni

    Mark Zanoni New Member

    Cincinnati, OH
    Joined:
    Mar 26, 2021
    Messages:
    48
    Update: Finally got around to a volumetric check, result was 5-oz in 8-sec so roughly 45-oz/min which is greater than the prescribed amount in the FSM. Double checked pressures and there was 4 psi while bowl was filling and 7-8 psi when needle was shut (trying to shut). So next steps - I have ordered another Carter style fuel pump from KW but I'm still baffled by why this NOS 4032 pump is producing too much pressure/volume (see below). I can only imagine the lever arm must be different to allow the same chamber size to produce a different pressure/volume. Alternately I see these pressure regulators that are available, has anyone had success with using that?

     
  11. Sep 1, 2024
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor

    East Tennessee
    Joined:
    Feb 8, 2021
    Messages:
    1,968
    Some of the dual action pumps require a spacer. This spacer will reduce the pressure, and volume, produced by the pump.
     
    scoutpilot and Fireball like this.
  12. Sep 1, 2024
    Dan72cj5

    Dan72cj5 New Member

    Chino 91710
    Joined:
    Sep 1, 2024
    Messages:
    6
    Got one from napa and other from jeepsterman. Jumps up about 5psi per stroke, holds for couple hours. seems like it could be possible if the stroke of the pump to to long it could overcome/jam the relief spring. I just don't get it
     
  13. Sep 3, 2024
    Mark Zanoni

    Mark Zanoni New Member

    Cincinnati, OH
    Joined:
    Mar 26, 2021
    Messages:
    48
    I was thinking the same thing so going to first compare this NOS pump with the Carter pump I just bought from KW.
     
  14. Sep 3, 2024
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    24,166
    Sorry - wrong thead.
     
  15. Sep 3, 2024
    Dan72cj5

    Dan72cj5 New Member

    Chino 91710
    Joined:
    Sep 1, 2024
    Messages:
    6
    built a spacer, on the road!!!! THANKS
     
New Posts