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  1. #1
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    Jan 2011
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    MF 40

    Default MF 150 Stalling - Did I say Help? Help!!!!

    Hello Y'all.

    Well, if I ever get my 1967 diesel MF running for any length of time I will be soooo happy. Just did a head gasket job on it but now I can't get it moving without it stalling. It will idle forever but when I press on the fuel pedal, outside of ginerly doing it, she stalls.

    Here's what I have done since discovering this issue:
    1. Drained all the old fuel
    2. Blew air into the fuel line to the tank to clean it as it was not flowing as much as it should.
    3. Changed the sediment bowl as it had a small crack in the lip.
    4. Replaced the fuel filter.
    5. Cleaned out the lines from the fuel filter into the injector.
    6. Just replaced one of the hoses leading into the fuel pump since it looked a bit worn.
    7. Have disconnected the air filter to make sure it wasn't that.
    8. Inspected all the connections for any signs of moisture.
    9. Air bled her more times than I can count.
    10. Prayed a lot.

    I can rev up the engine if I do it very slowly. I'm thinking there must be an air leak or something but for the life of me I can't find it. Or maybe it's something completely different.

    Any ideas?

    Thanks so much for any input.

  2. #2
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    Default Re: MF 150 Stalling - Did I say Help? Help!!!!

    Nevermind, I see that you said it was a diesel. I really need to stop skim reading.

  3. #3
    Super Member flusher's Avatar
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    Getting old. Sold the ranch. Sold the tractors. Moved back to the city.

    Default Re: MF 150 Stalling - Did I say Help? Help!!!!

    I'd take a good look at the injection pump. Unfortunately, the MF service and parts manuals are no good for that pump (at least that's the way it is with the manuals for my 1964 MF135 diesel). Understandable, since MF didn't manufacture the injection pump so there's nothing in the MF manuals about the guts of that pump.

    Good luck.

  4. #4
    Gold Member the6shooter's Avatar
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    Dec 2006
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    oklahoma
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    MF 1643

    Default Re: MF 150 Stalling - Did I say Help? Help!!!!

    have you checked for a kink in the fuel lines ? have you losed up the injectors and bled them from each injector ? and last but not least, is the fuel line too small ? Can't think of anythin else, beczuse the pump has already been covered.
    david

  5. #5
    Member
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    MF 40

    Default Re: MF 150 Stalling - Did I say Help? Help!!!!

    Thanks for your replies.
    The6shooter - I have checked before but I will check tomorrow again for kinks. You know, I have not loosened the injectors. I thought that since I've had it running for up to 40 minutes at a time that the injectors were not an issue. But if you think that could be it, I can do that. The fuel lines are the standard 1/4". I replaced a small section of it with fuel line of the same diameter a while back so I could have a better way to manage the the connections to the fuel pump. That was some time ago and it ran just fine with those modifications.

    Flusher - I do have an fuel injector manual more or less. It's a CAV. The AGCO parts site also has some good views of the parts. I have in the past worked on the injector, replacing the O rings.

    After looking at several threads from the past I'm wondering if it really isn't something in the fuel tank. I'll clear it again and check.

    Again thanks for your concern and advice. I appreciate your help and wisdom.

  6. #6
    Gold Member the6shooter's Avatar
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    MF 1643

    Default Re: MF 150 Stalling - Did I say Help? Help!!!!

    Rebol, all it takes is an air bubble in the fuel lines at the collector rail or the injectors, to disrupt the fuel flow to the injector. almost like a dirty fuel filter does. It will idle, but once you demand power it runs short.
    I hope this makes sense.
    david

  7. #7
    Member
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    Default Re: MF 150 Stalling - Did I say Help? Help!!!!

    Is that right? Hmm. I did re-clean the line from the tank to the pump once again. The next item will be to bleed the injectors then.

    I should ask have you've seen this same behavior before?

    Thanks,
    James

  8. #8
    Member
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    Default Re: MF 150 Stalling - Did I say Help? Help!!!!

    Oh, yes, I did check also for any kinked cables. None found.

  9. #9
    Gold Member the6shooter's Avatar
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    oklahoma
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    MF 1643

    Default Re: MF 150 Stalling - Did I say Help? Help!!!!

    yes I have seen it before, the cure was to loosen the injectors one by one, and purge them. you don't have to compleatly remove them just break them loose enough for the air to get out. other than that maybe the pump is weak.
    And you know what that means $$$
    david

  10. #10
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    MF 40

    Default Re: MF 150 Stalling - Did I say Help? Help!!!!

    Thanks David. I did crack them yesterday but still have the issue. I did, for the first time notice what I think is some moisture on one of the lines. I'll get at that today.

    Thanks again. I really appreciate it.

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