94 Ski Nautique Carb Issue

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  • Skidave
    Senior Member of PLANETNAUTIQUE
    • May 2005
    • 697

    • York, PA

    • 2003 Air 206 Team Sold: 1979 Ski Nautique (Brown!)
    #1

    94 Ski Nautique Carb Issue

    Need some help with the factory Holley carb on a 1994 Ski Nautique (PCM 5.8). This is my Aunt and Uncle's boat and my Uncle passed away in the fall, so I winterized and now I am doing spring maintenance. It has been 10+ years since I sold my old Nautique which had the same carb.

    When I tried to start the boat for the first time, I had fuel everywhere...on top of the intake and in the bilge. It took me about a minute of panic and another minute of trouble shooting to find the leak. It is leaking from the carb where the fuel line goes into the primary and also slightly leaking from the secondary. It is leaking on the side of the carb where it looks like there is some sealant covering the round end where the fuel lines meet the primary and secondary. It looks like they were sealed with some sort of sealant. It is NOT leaking from the fuel line or where the fuel line connects to the primary. The fuel leaks right above where the fuel line feeds the primary. The fuel followed the fuel line down to the fuel pump and that is how it got into the bilge.

    Is sealant around there normal? Web pictures of a factory (non-marine) carb show different options; covers, bolts, etc. I don't have the time to link a photo or grab a photo at this moment. I was hoping my description was ok and people would understand.

    After some more looking, these have been leaking for a while due to the stains on the intake manifold. Strangely, it leaks when you are cranking the motor. If the motor does not start, the fuel goes everywhere. When it is running, the fuel does not really leak out (not really is not safe, and it will be addressed). I'm guessing it leaks like that when the motor is not running because there is no venturi affect to pull the fuel into the intake??? I would think it would leak all the time.

    This carb was rebuilt about 2 years ago. Looks like I am going to have to pull it and rebuild it now.

    Any info about the sealant or the type of leak would be appreciated.
    Tags: None
  • Skidave
    Senior Member of PLANETNAUTIQUE
    • May 2005
    • 697

    • York, PA

    • 2003 Air 206 Team Sold: 1979 Ski Nautique (Brown!)
    #2
    Found this information: http://forums.holley.com/showthread....at-bowl-PLEASE

    Also talked to the shop that rebuilt the carb a few years ago and they said the fuel bowls are factory sealed like that (if you are not using those ports for fuel supply). They also said they will leak over time. Replace the bowls or do the JB-Weld trick.

    Comment

    • Skidave
      Senior Member of PLANETNAUTIQUE
      • May 2005
      • 697

      • York, PA

      • 2003 Air 206 Team Sold: 1979 Ski Nautique (Brown!)
      #3
      And more information from our friends (includes photos): http://www.correctcraftfan.com/forum....asp?TID=27007

      Comment

      • Mamigacz
        • Oct 2012
        • 118

        • Sheboygan Falls, WI

        • 1986 Ski Centurion concourse skier
        #4
        See the attached photo:

        My assumption is the area with sealant isaround area’s C and D? Please confirm?
        If yes, this doesn’t need sealant. If the O-rings are ripped or hardened from age they should be replaced. Silicone (RTV) sealant is not good for gasoline. Most gas has ethanol in it and the alcohol breaks down silicone sealant. What type of sealant is it?

        I’m confused where it is actually leaking. Can you reply with which letter the leak is closest to?

        That is really weird that it does not leak whenits running. Does it run like **** when it starts?
        Attached Files

        Comment

        • Skidave
          Senior Member of PLANETNAUTIQUE
          • May 2005
          • 697

          • York, PA

          • 2003 Air 206 Team Sold: 1979 Ski Nautique (Brown!)
          #5
          It is leaking from areas 'B' and 'E'. In your photo (thank you for a decent photo), it looks like those are plugs or caps. In reality, mine is filled with a metal epoxy or JB Weld material. I think what happened was over the winter, the fuel evaporated and the epoxy material started to loose its bond to the metal of the carburetor and it was leaking when I first ran the motor. The epoxy felt soft and loose. Once the fuel hit the epoxy long enough, it hardened and then stopped leaking. If you click on the link in post 3 and look at the information and photos provided there, it should make more sense.

          I can't imaging Holley would not have used a threaded plug for those holes. There are many options for fuel supply, but epoxying the unused option doesn't seem like the best...

          The boat ran fine once it was started. No other issues.

          Comment

          • Mamigacz
            • Oct 2012
            • 118

            • Sheboygan Falls, WI

            • 1986 Ski Centurion concourse skier
            #6
            It sounds like a lot of people have had success with the JB-weld fix. JB weld is petroleum resistant, but it is not Alcohol resistant. With most fuels have 10% ethanol in them, they will eventually break down (soften) an epoxy like JB weld. It probably takes a long time to break down, so you could grind the old epoxy out and reapply JB weld.

            Or you could drill the plugs out, tap and plug with an NPT plug. A thread sealant to use with the NPT plug that works well with ethanol is a product called Seal all.

            Comment

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