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Best mechanical fuel pump replacement?

Discussion in 'Early CJ5 and CJ6 Tech' started by nestle105, May 12, 2013.

  1. May 12, 2013
    nestle105

    nestle105 New Member

    Central New York
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    Dec 3, 2012
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    This weekend my electric fuel pump that the PO installed decided to quit. I was going to just replace it with another electric one but then got the idea to try the mechanical that was still attached and just unhooked. To my surprise it worked (after some thorough cleaning). I proceeded to run all new steel lines and hook it up correctly. The motor fired with only 10 seconds of cranking and runs smooth. The pump does have the vaccuum port, but is plugged since the wipers were converted to electric.

    The only problem I have is that the pump leaks below the inlet port and below where the halves split. I would like to replace it with a new non vaccuum pump, which leads me to my question. What brand is recommended? I do like the glass bowl factory look but it's not a issue if the better pump does not have it. I appreciate any advice on this. Thanks.
     
  2. May 12, 2013
    XC_Jeeps

    XC_Jeeps New Member

    Richmond VA
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    Mar 17, 2013
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    I have an airtex replacement in right now that does not have the bowl. It seems to perform decently well, but the inlet/outlet ports are the reverse of the factory pump it replaced.
     
  3. May 12, 2013
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    The usual suspects are Carter, Airtex and Delco. Bosch is making a play for part of the market, but I have no data on them. RockAuto only shows Airtex, with and without a vacuum pump. Buy a new one, not reman. Avoid Omix-Ada.
     
  4. May 12, 2013
    1967 CJ5A

    1967 CJ5A Mike 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Raleigh, NC
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    I bought an airtex replacement. My original was not a glass bowl type, and the replacement is pretty much identical.
     
  5. May 12, 2013
    PeteL

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

    Hills of NH
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    Can't fix the leaks? These pumps are rebuildable - if you can find a kit today.
     
  6. May 12, 2013
    nestle105

    nestle105 New Member

    Central New York
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    I'm not sure if the leaks can be fixed or not. It looks like its leaking from two small holes below the inlet port on the bottom half. I have never taken apart or seen the inside of one of these pumps. Is there anything wrong with plugging the vacuum port since its not being used?
     
  7. May 12, 2013
    PeteL

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

    Hills of NH
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    Sounds like the pump diaphragm may be worn out and perforated. If so, I believe there may be a risk of gasoline diluting the crankcase oil - not a good thing.

    Easily repaired if you can locate a rebuild kit. Try ebay, Jeep NOS suppliers, etc.
     
    Last edited: May 12, 2013
  8. May 13, 2013
    nestle105

    nestle105 New Member

    Central New York
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    Is the pump with the glass bowl on Walck's site any good? It looks a lot like the Omix Ada one.
     
  9. May 13, 2013
    1967 CJ5A

    1967 CJ5A Mike 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Raleigh, NC
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    I think Debella Jeep parts has a rebuild kit for about $45
     
  10. May 13, 2013
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
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  11. May 13, 2013
    nestle105

    nestle105 New Member

    Central New York
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    Dec 3, 2012
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    I went ahead and purchased an airtex to run for now. Since it was originally set up for vacuum wipers and now it won't be, what do I do with the line below the carb that comes out of the head? Just plug it? Is there anything else I need to modify to convert to a non vaccuum system?

    The picture below shows 1 of the 2 holes where gas was leaking from. It looks like I will be changing the oil now.
    [​IMG][/URL][/IMG]

    The next pic shows one plugged vacuum line and the other that I assume went to the wipers left cut off.
    [​IMG][/URL][/IMG]
     
  12. May 14, 2013
    WorkInProgress

    WorkInProgress Member

    Kennewick, Wa
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    This Non-vacuum pump from walcks http://walcks4wd.com/fuel-pump-glass-bowl-no-vacuum.html I bought one and used it for 6 months and it worked fine with no problems. I only used it for 6 months since I came across a NOS Dual action AC 4693. when It comes time to rebuild my dual action AC4693 pump I will likely be buying a rebuild kit from this site http://www.classicpreservation.com/fuelpumpkits.html since they claim quality USA new manufacture parts. If I remember right when I requested a parts quote it was around $50 and that was only 2-3 months ago.

    One more thing I forgot to add is also claims the classic preservation kits are made to handle new alcohol based fuels
     
    Last edited: May 14, 2013
  13. May 14, 2013
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
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    I just did mine with the "Then & Now" kit & i have to say I'm glad theirs came with the diaphragm push rods/plates pre assembled- these look like a bear to get apart & without the proper sleeve & crimper I'm not sure how you'd get them back together again without a a lot of work & modifications. I'm not saying the kit I got was perfect (they sent the wrong fuel diaphragm at first) but it was an easy job putting it together.

    H.
     
  14. May 14, 2013
    Alan28

    Alan28 Well-Known Member 2022 Sponsor

    Châtillon en...
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  15. May 14, 2013
    nestle105

    nestle105 New Member

    Central New York
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    So to do away with the vacuum system, I just need to plug the vacuum line where it T's into the PCV? Correct?

    Is there anything else that I need to modify to convert?

    Thanks.
     
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