Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › Cummins 5.9 QSB 425 fuel pump

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  • March 31, 2023 at 3:24 pm #145763

    worldcatlemon
    Participant
    Vessel Name: Adjusted Priorities
    Engines: QSB 425 Cummins
    Location: Pacific Northwest
    Country: United States

    A local cummins shop recommends getting rid of the fuel pump on the Qsb 5.9 and going with a 100 or 150gpm lift pump instead.   His opinion is the original fuel pumps on the engine is prone to failure.    Any thoughts ?

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  • April 2, 2023 at 2:17 pm #145829

    worldcatlemon
    Participant
    Vessel Name: Adjusted Priorities
    Engines: QSB 425 Cummins
    Location: Pacific Northwest
    Country: United States

    The engine is a 2005 with 143 hours. I stripped the engine down to the block to service everything and repaint it. So I have the ecm and fuel pump already removed….and you’re right it was a pain.

     

    Are there fuel pumps more suitable for the marine application instead of an automotive style ? Or would it be better while it is apart to replace with a newer style OEM fuel pump ?

    April 1, 2023 at 6:55 pm #145802

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    How old is your QSB 425 and have you had a failure? That should your answer. 

    Yes back in 2004-2006 the QSB 5.9 fuel pumps had a high failure rate –maybe 25% ?  Now days=NO 

    As far as replacing the pump–The access / work involved to R&R it  is worse that anyone could imagine. Some couch engineer/designer  buried it behind the ECM.

    As to an aftermarket pump–That would be your call–It would need to be continuous duty,  and have a flow rate of at least 45 GPH at 10-12 PSI..

     

     

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