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1955 Willys CJ5 pulling oil into carburetor from oil bath ?????

Discussion in 'Early CJ5 and CJ6 Tech' started by PatC, Nov 23, 2015.

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Page 2 of 2
  1. gunner

    gunner Member

    An old diaphragm on an old fuel pump is not uncommon. If the diaphragm isn't replaced by a ethanol resistant one, you not only have the age going against the pump, you have the ethanol acting on it.

    Outfits such as Then and Now will rebuild your pump for both the diaphragms in it (it has two- one for the fuel and one for the vacuum wipers). It's not cheap, as I recall it was $150 for my military one (that's with shipping included). You could consider going with an electric pump. My original pump gave out and was putting gas into the crankcase. As mentioned, that thins the oil, causing both lubrication deficiencies and allowing the oil to pass the rings and valve guides much more easily and ending up on your buddies car.
     
    gunner, Nov 25, 2015
    #21
  2. WorkInProgress

    WorkInProgress Member

    The internal metal filter mesh IS NOT REMOVABLE on civilian jeeps just leave it in and soak the whole filter assembly if needed
     
    WorkInProgress, Nov 27, 2015
    #22
  3. PatC

    PatC New Member

    Thanks everyone. I finally pulled the pump and still need to test for leaks through it. It was recommended by a local mechanic to put fuel into it and see if it disappears. From what I've found there is no repair kit for it that I can buy, but there are replacement units available from multiple vendors. Did smell fuel when we pulled the pump, but thought it may be normal. I really appreciate everyone's input.
     
    PatC, Dec 16, 2015
    #23
  4. WorkInProgress

    WorkInProgress Member

    I don't believe a all metal fuel pump is original for your jeep. So personally I wouldn't worry about rebuilding it, I would just replace it. I know napa sells both kinds of replacement original style pumps. One with vacuum and one that is gas pump only. Or they can be purchased at all jeep vendors online for these old jeeps. I'm sure O'Reilly or autozone would also probably have it
     
    WorkInProgress, Dec 16, 2015
    #24
  5. Glenn

    Glenn Kinda grumpy old man Staff Member

    The ones with vacuum were all metal as far as I know, and I would have thought they would be original?
     
    Glenn, Dec 16, 2015
    #25
  6. PeteL

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

    I have always had glass dome tops on all my civilian F-heads, all with combined fuel/vacuum pumps. OEM I believe.
     
    PeteL, Dec 17, 2015
    #26
  7. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Agreed, civvys are glass domed, all metal are military.

    H.
     
    Howard Eisenhauer, Dec 17, 2015
    #27
  8. Glenn

    Glenn Kinda grumpy old man Staff Member

    That's interesting. I haven't seen a glass domed vacuum before. I think however shouldn't your post say all military are all metal? They normally have a primer handle, and there are plenty of all metal fuel pumps out there without them. For example, all metal dual pumps are the only thing I've seen for the 226 wagon/truck engine.
     
    Glenn, Dec 17, 2015
    #28
  9. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    I haven't seen any all metal ones on a CJ5 F4, going by the illustrations from the military & civilian service & parts manuals civvy are glass, military are metal so while you have a point I have one too.:p

    H.
     
    Howard Eisenhauer, Dec 17, 2015
    #29
  10. Glenn

    Glenn Kinda grumpy old man Staff Member

    It's a tie! :D It is interesting, I definitely don't recall seeing a glass domed vacuum one. Or of course just looking at a picture maybe I didn't realize it was dual. ;)
     
    Glenn, Dec 17, 2015
    #30
  11. WorkInProgress

    WorkInProgress Member

    my 59 has a glass domed vacuum/fuel pump and if i remember correctly the part number is AC4693
     
    WorkInProgress, Dec 17, 2015
    #31
  12. Glenn

    Glenn Kinda grumpy old man Staff Member

    Well, a search turned up multiple glass bowl top, dual action, various brand pumps. It also turned up way more with metal tops. That explains why there is less chance of finding one with the glass top. Single action glass tops are way more plentiful. Interesting. This was of course a search for the 134 engine pumps.
     
    Glenn, Dec 17, 2015
    #32
  13. PatC

    PatC New Member

    It may not be original, but when I look up the part, it looks just like the all metal dual action fuel pumps I find as replacement parts. I think it is original, just because of how long I've owned it and the low mileage. I've had it since 1986. I still need to test it, but from looking at the cost it may be worth replacing since I already have it off.
     
    PatC, Dec 18, 2015
    #33
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