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  1. #1

    Onan 15.0 MDJF Generator injector pump fuel leak

    I’ve taken the injector pump to Metro injector service in Conn. They are a large rebuild shop with shops all the way to Fla. It’s a rotary pump that they can’t find parts for anymore. The fuel is leaking out the throttle shaft. Does anyone have a parts machine that I could buy or another place to take the pump to.
    If I have to replace the unit has anyone put one in under the galley floor with out tearing the boat apart to get it in. I would think about putting in a lower kilowatt unit ,smaller physical size to make installation easier. Will post picture of pump when I figure how.

    Salty Lady 53’ MY 1979. #555
    In Conn leaving for Fla soon

  2. #2

    Re: Onan 15.0 MDJF Generator injector pump fuel leak

    Most of them that were replaced seem to have been swapped for a NL unit. I think they are overall a bit smaller. Parts are much more available from all I have ever heard.

  3. #3

    Re: Onan 15.0 MDJF Generator injector pump fuel leak

    If your looking for the ole Stanadyne pump, good luck.
    As lots of parts for the oldies just are not available anymore.

    We have removed a couple of those Cummins/Onan MD3 & 4 sets.
    Mostly due to lack of repair parts.
    The MD has to be torn down in pieces for removal (to the short block).

    The electrical end and pan come apart for the NLs going in.

    Study the under floor carefully from the generator room. Some are designed to come up and offer larger access to those old monsters.

    Replacing the OhNo 15 is going to be a tough call with the new set going in.
    NL 12KW is a nice 3 cylinder unit, the next size is a 4 lung 16KW unit.
    I would recommend the 16kw, holds about twice as much engine oil.

  4. #4

    Re: Onan 15.0 MDJF Generator injector pump fuel leak

    The pump is a PSU. What is the model Onan that you refer to 12kw?
    Thanks for all the input so far

  5. #5

    Re: Onan 15.0 MDJF Generator injector pump fuel leak

    Quote Originally Posted by Salty lady View Post
    The pump is a PSU. What is the model Onan that you refer to 12kw?
    Thanks for all the input so far
    Sorry, I poorly just typed NL, I should of typed out Northern Lights.
    I was referring to the Northern lights 12 or 16KW as replacements for your 15KW if you were going to replace it.

  6. #6

    Re: Onan 15.0 MDJF Generator injector pump fuel leak

    If you are going to replace the GenSet, work on ordering the new one NOW. There is a shortage on GenSets in the market currently and lead times are long. BTW, I second the Northern Lights (NL) as a replacement for the Onan. I swapped my Onan MDL4 (20KW) 2 Stroke for a new NL 20KW 4-stroke. The weight difference between the two was within a few pounds and a slightly smaller footprint. We have been very happy with the new quieter and peace of mind knowing parts are readily available should they be needed.
    Best regards,
    --
    David

  7. #7

    Re: Onan 15.0 MDJF Generator injector pump fuel leak

    I have a rebuilt pump on the shelf, or I can probably find the part you need. Shoot me a PM if you're interested.
    Last edited by Avenger; 09-18-2021 at 08:11 AM.
    --- The poster formerly known as Scrod ---

    I want to live in Theory, everything works there.

    1970 36C375

  8. #8

    Re: Onan 15.0 MDJF Generator injector pump fuel leak

    Avenger. Sorry not tech savvy. Couldn’t figure how to pm. Will get a friend to help tomorrow. Very interested to talk with you about pump or parts.
    please email me at saltcityboston@gmail.com
    Thanks Salty Lady 53’ my #555

  9. #9

    Re: Onan 15.0 MDJF Generator injector pump fuel leak

    I'll send an email when I get to the shop on Monday and we'll figure this out.
    --- The poster formerly known as Scrod ---

    I want to live in Theory, everything works there.

    1970 36C375

  10. #10

    Re: Onan 15.0 MDJF Generator injector pump fuel leak

    I have that Northern Lights 16 kW set as the standby at my house in Annapolis. They are outstanding gensets, I don't think there are any better. I have a smaller one on my 36' Hatteras.

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