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surf induced water in fuel tank

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    surf induced water in fuel tank

    here is the problem i am having and i think i have the solution but feel free to tell me i am wrong or even better tell me where i can purchase the part i assume i need.

    last week we weighted the girl down (1999 21v riders edition, 350 mercruiser MPI SKI 315 HP) with about 2,000 lbs of water on the port side and it ran great for two runs and on third run she started to sputter and cough. we shut down the ride session, empty ballast and pull off the lake. i idled all the way back so it did not start to choke again.

    When i got her home the seperator was 7/8 full of water. i used a siphon pump and removed another quart + of straight water from the fuel tank itself. I fixed that and she ran great for two days, but only using 1200 lbs water. today we load up 2,000 lbs again and the boat starts to cough after the third run. sure enough the seperator is full of water.

    i have switched to pure premium non-ogegenated fuel and used 2 bottles of heat to remove any excess water.

    my idea is that the fuel tank vent is allowing water to come in to the fuel tank as it pretty much rides under water when we are surfing with 2,000 lbs in it. easy answer: stick to 1,200 lbs. but i am assuming there is an anti siphon on the vent but i cannot locate the part... yet.

    any ideas? am i crazy?

    #2
    The only check valve I know of is a fuel surge preventer to prevent fuel splashing out when filling the tank. I think you answered your questions, use less ballast to keep the fuel vent out of the water or re-route your fuel vent farther forward on the boat to keep it above waterline.
    2009 RZ2, PCM 343, MLA Surf Ballast, Premium Sound.
    2013 Toyota Sequoia 4WD W/Timbren SES

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      #3
      ok, i think we have the solution. duct tape and a snorkel. ill post pics next week and let you all know how if goes.

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        #4
        Originally posted by clinton View Post
        ok, i think we have the solution. duct tape and a snorkel. ill post pics next week and let you all know how if goes.
        You are a rigger of epic proportion...
        So this monkey walks into a bar...

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          #5
          Make sure the fuel tank vent hose is arranged such that it loops up and above the thruhull. This will help prevent backflow of water.

          You could also install a new thruhull, higher on the hull. Just cap off the old one rather than trying to fix the fiberglass.

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            #6
            WABoating, that sounds like a great idea. i kinda like the snorkel idea though.

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