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  1. #1

    Default Cummins Mercruiser 2.8 Fuel Leak

    Hey guys,

    I have a problem with a fuel leak on a Cummins Mercruiser 2.8 diesel.

    The fuel is apparently coming out of the flange between the starter motor and the flywheel housing. It only leaks when it's running.

    I'm kinda confused because no fuel lines are in that area but the fuel is foamy and streams out.

    Does anybody have any information where to look for a fuel leak in the back of the block near the starter motor?

    Thank you

  2. #2
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    6,410

    Default Re: Cummins Mercruiser 2.8 Fuel Leak

    Post the serial number.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  3. #3

    Default Re: Cummins Mercruiser 2.8 Fuel Leak

    Serial number is 88010692

  4. #4
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    6,410

    Default Re: Cummins Mercruiser 2.8 Fuel Leak

    No fuel located in the flywheel housing....

    To find this leak, you can buy tracer dye and add it to the fuel tank. Run the engine until the dye is through the system and look at it with a black light. Easiest way to pinpoint a leak.

    Your local auto parts store should have the dye and the light.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  5. #5

    Default Re: Cummins Mercruiser 2.8 Fuel Leak

    So my question is where would fuel be leaking in that area that would be coming out of the starter motor flange?

    The fuel supply hose and low pressure pump is in the center of the engine and I can't easily identify where it's coming from.

    It's just boggling that fuel is coming from somewhere that there's no fuel around

  6. #6
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    6,410

    Default Re: Cummins Mercruiser 2.8 Fuel Leak

    I am not on your boat so I am giving you the next best way to find a leak.

    The dye will pin point the leak.... The black light will show the dye brighter where the leak is.

    The fuel is possibly spraying.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

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