Fuel or Oil Leak Under Stern

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  • Vector
    • May 2011
    • 35

    • CT

    • 2005 221
    #1

    Fuel or Oil Leak Under Stern

    I have a 2005 SV211 in great shape. Yesterday I noticed a fuel or oil coating on the water near my swim platform (see attached photos). I checked the bilge for fuel or oil and found nothing. No odor or evidence of leaks. At this point, I concluded the leak must be underwater. I thought someone might have had this issue in the past. An y advice would be appreciated. Thank you.

    Click image for larger version Name: Nautique Leak 2.jpg Views: 32 Size: 58.5 KB ID: 639972 Click image for larger version Name: Nautique Leak 1.jpg Views: 36 Size: 62.1 KB ID: 639973
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  • James
    • May 2007
    • 151

    • Indian Wells, CA

    #2
    I am not a mechanic but I would think it is most likely coming out of the exhaust. How many hrs on the engine? How does the engine run? What color is your exhaust? If it is incompletely burned fuel is could be a leaky injector or bad spark plugs. If it is oil it could be rings or worn valve guides etc. I would start by checking/changing the spark plugs and checking the compression.

    Comment

    • Peter6000
      • May 2017
      • 168

      • northern Virginia

      • 1999 Ski Nautique
      #3
      Originally posted by Vector View Post
      I have a 2005 SV211 in great shape. Yesterday I noticed a fuel or oil coating on the water near my swim platform (see attached photos). I checked the bilge for fuel or oil and found nothing. No odor or evidence of leaks. At this point, I concluded the leak must be underwater. I thought someone might have had this issue in the past. An y advice would be appreciated. Thank you. Click image for larger version Name: Nautique Leak 2.jpg Views: 325 Size: 58.5 KB ID: 639972 Click image for larger version Name: Nautique Leak 1.jpg Views: 256 Size: 62.1 KB ID: 639973
      Stick your hand in it you should be able to tell if its oil or gas.
      Or scim some of into a clear glass and let it sit for a while gas should evaporate oil will stay. I have never tried this.
      I agree only way out is the exhaust. It has only two ways
      -through the combustion chamber oil would also make it smoke when the engine runs. If gas, a leaky fuel injector would make it loose power. Check the spark plugs if bad injector one will look different.
      If it's just running to rich all plugs would be dark.
      If possible run it on a trailer with fake lake.
      -you could have a leak between cooling water and oil this would go both ways your oil on the dipstick would look milky.

      Sent from my SM-G892A using Tapatalk

      Comment

      • shag
        1,000 Post Club Member
        • Jul 2003
        • 2217

        • Florida

        #4
        Just a thought, but was the boat full of fuel when this occurs? I have seen occasionally where an over full boat (topped off) will push a tiny bit out the vent hole in the heat...

        Comment

        • gary s
          • Mar 2015
          • 334

          • Algonquin IL

          • 1969 Mustang SS, 1995 Nautique SS, 1978 Shamrock 20, 1988 Shamrock 170
          #5
          Check and keep an eye on your trans and vdrive oil levels. A cooler can have an internal leak,it does not take much oil to make a mess

          Comment

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