Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › 2017 qsb380 quit running.

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  • July 21, 2020 at 9:26 am #101151

    john
    Participant

    On the water now. Engine died. Getting fuel pressure low center alarm. Engine cranks but does not fire or run. Sounds like a lift pump failure.

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Viewing 8 replies - 1 through 8 (of 8 total)
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  • July 25, 2020 at 12:32 pm #101335

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

    The QSB 5.9 has an odd fuel system ( Cummins variant/design) not Bosch like the 6.7, QSC & QSL..

    Elec. pump times out before start but once started, it needs to run 100% all the time or the engine falls on it face or will not run at all. Early on for the 1st few years there was a very high failure rate of these pumps……Also, it is very frustrating to R&R as it’s hidden behind the ECM.

    July 25, 2020 at 8:15 am #101333

    john
    Participant

    Does it fine out or does it go off because of sufficient pressure and come on again?

    July 23, 2020 at 3:09 pm #101266

    Fireisland1
    Participant
    Vessel Name: Riverwind
    Engines: cummins QSB 380
    Location: long island n.y.
    Country: usa

    380 pump times out also

    July 23, 2020 at 8:42 am #101240

    john
    Participant

    So doing a little research the lift pump on a qsb 6.7 shuts off after one minute or when sufficient pressure. So might not be the lift pump. I guess the 5.9 it runs continuously. Kind of frustrating because the owner is now gun shy on taking the boat out. Everything looked perfect

    July 22, 2020 at 12:30 pm #101200

    john
    Participant

    Here is the odd thing. Went down to the boat and cranked it a few times and got it running. Running good and no fuel error codes.

    July 21, 2020 at 6:50 pm #101176

    john
    Participant

    It was a friend and I ended up just towing him in. He talked to the previous mechanic and he said it was most likely a clogged fuel filter. The ten micron racor was perfect. He was saying the engine filters were 3 micron. I don’t really know. sounds like the lift pump is coming on. To me I would think it would give more of a lack of power with a fuel filter. Not just cruising at 1900 and bam not running or starting. I will look tomorrow and see if its actually pumping. Thank you for the response.

    July 21, 2020 at 2:26 pm #101169

    Fireisland1
    Participant
    Vessel Name: Riverwind
    Engines: cummins QSB 380
    Location: long island n.y.
    Country: usa

    Open the front Allen screw on top of engine fuel filter. Turn key to on position. Should get fuel flow . If not you could be right.

    July 21, 2020 at 9:28 am #101152

    john
    Participant

    Here is a picture

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