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Low power under load - 3988 Cummins 330

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    #16
    I tend to agree with others sounds like a dirty pickup.
    1995 3988 250 Hinos
    "When mad yell, when really mad curse"

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      #17
      Unlikely, but it may be a bad selector valve. You could swap the hoses on the selector valve temporarily. If the problem moves to the other tank, the valve is bad.
      1999 3788, Cummins 270 "Freedom"
      2013 Boston Whaler 130 SS
      Anacortes, WA

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        #18
        Renilyab, I think you've got it all backwards.
        Jeff & Tara
        (And Ginger too)
        Lake Havasu City, AZ

        2000 Bayliner 3388
        "GetAway"
        Cummins 4bta 250s

        In memory of Shadow, the best boat dog ever. Rest in peace, girl. July 2, 2010

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          #19
          I inspected the hose to the valve from the tank and nothing is obviously bad.

          It doesn't seem like a good idea to blow out the line and put whatever is causing the obstruction back in the tank.
          If I remove the outlet fitting on the top of the tank does the pickup tube come out with it?

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            #20
            You should be able to remove fitting from the top of the tank with the pickup tube.
            1995 3988 250 Hinos
            "When mad yell, when really mad curse"

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              #21
              I had exactly the same symptoms with my 4087 & 250 turbo Cummins. Turned out to be a loose turbo hose clamp, not replaced correctly after a service. Engine would get to about 1400rpm and stay there. Check all your turbo hose fittings and hoses.
              1996 4087 Lazy Days
              2011 11’ West Marine Rib 350 Lazy Mac
              2011 Porsche Cayman
              2010 Lexus IS 250C
              2008 Honda Ridgeline

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