Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › QSM11 Hunting

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  • October 10, 2022 at 8:38 pm #137760

    Bryant Yunker
    Participant
    Vessel Name: NERO
    Engines: QSM-11
    Location: NYC
    Country: USA

    I have a 2022 Sunreef Power Catamaran that has an issue with a Cummins QSM-11 engine. After 4-5 hours running at 40% engine load the rpms drop 200-300 RPM’s every 30-40 seconds, increasing to a drop of 500 RPM’s. Eventually the engine shuts down. Have Fuel polisher and Racor Water/Filter system. Only on one engine, dual tanks with 1300 gallon capacity. Only issue on on engine. Any thoughts are greatly appreciated and truly am happy for this community.

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  • October 30, 2022 at 5:05 am #138325

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

    Sounds like classic fuel starvation– Install a vacuum gauge close to the on-engine filter ( 0-15″ hg) –Something ( crud)  is being picked up inside the tank and is probably not even  making it to your off engine filters.. A vac gauge would confirm yea or nay

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