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Cummins N14 fuel pump leakimg?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by thesvg, Oct 17, 2017.

  1. Oct 17, 2017 #1
    thesvg

    thesvg Light Load Member

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    20171017_122800.jpg Hey all!

    Has anyone ever encountered a fuel leak in their N14 fuel pump by the filter housing?

    At first I thought it was the com fitting, but after taking it off and placing a plug, the fuel leak still persistent.

    It only leaks while it's cold, cranking, and a few seconds after it warms up. No leaks when it's warm, and running. [​IMG]

    Fuel puddles up on top of the filter, but the housing above it gets wet. Here's a pic

    20171017_122800.jpg
     
    thesvg, Oct 17, 2017
    thesvg, Oct 17, 2017
    #1
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  3. Oct 17, 2017 #2
    Heavyd

    Heavyd Road Train Member

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    Probably leaking from between the housings, orings dried out, shrunk.
     
    Heavyd, Oct 17, 2017
    Heavyd, Oct 17, 2017
    #2
    thesvg Thanks this.
  4. Oct 17, 2017 #3
    thesvg

    thesvg Light Load Member

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    Dec 9, 2010
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    Is this serviceable? Just unbolt, and replace o-rings?
     
    thesvg, Oct 17, 2017
    thesvg, Oct 17, 2017
    #3
  5. Oct 17, 2017 #4
    Heavyd

    Heavyd Road Train Member

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    I am sure it is. It's been a while. That section between the filter base and engine block is the pulsation dampener. It could be leaking too, and also has a sandwich of plates and orings. We don't see too many N14 anymore, and I can't even remember the last time I changed a fuel pump for one. If this pump is original or been there for a while, I would replace the whole pump as it is probably worn and tired anyway.
     
    Heavyd, Oct 17, 2017
    Heavyd, Oct 17, 2017
    #4
    Justrucking2 Thanks this.
  7. Oct 17, 2017 #5
    boneebone

    boneebone Road Train Member

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    If it's leaking when it's cold, it's because the o-rings have contracted and is letting fuel seep through.

    When it's running, the engine heat plus the fuel is expanding the seals preventing fuel from leaking out.

    I would remove it and replace the o-rings and it should be fine.
     
    boneebone, Oct 17, 2017
    boneebone, Oct 17, 2017
    #5
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