Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › 4BT fuel line.

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  • July 25, 2023 at 9:49 am #152136

    Shannon Ritzert
    Participant
    Vessel Name: Hot Mess
    Engines: 4bt
    Location: Port Aransas
    Country: United States

    I had a line break from the cav pump to the injector over the weekend. The parts manual shows 2 different possibilities for a fuel line:

    3903523 which is 1.8mm
    or
    3906030 which is 2.0mm

    my pump tag:
    U3042F310
    17880058FDU
    99L1400-9-3075

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  • July 28, 2023 at 2:41 pm #152354

    Shannon Ritzert
    Participant
    Vessel Name: Hot Mess
    Engines: 4bt
    Location: Port Aransas
    Country: United States

    The tags have fallen off all the fuel lines. I mic’ed out the ID at 2.0mm and ordered those. Hopefully I made the right decision on that.

    July 26, 2023 at 6:18 pm #152223

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

    Look very carefully on the fuel line that broke for and aluminum -removable tag that has a part number on it.. Probably full of paint.

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