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  1. #1

    Default 2007 LSV Vapor Lock?

    On lake Norris TN today, temps in the high 70, ran boat most of day, let boat sit for 45 minutes, tried to start back up & ran very rough...coughing etc, shut it off, opened engine compartment for an hour, came back, started right up & ran fine. Could this be vapor lock? Any suggested fixes. Just bought the boat a few weeks ago, other than this issue it runs great! Thanks Pat

  2. #2
    Join Date
    Aug 2011
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    2,383

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    Quote Originally Posted by Patrick Sedlak View Post
    On lake Norris TN today, temps in the high 70, ran boat most of day, let boat sit for 45 minutes, tried to start back up & ran very rough...coughing etc, shut it off, opened engine compartment for an hour, came back, started right up & ran fine. Could this be vapor lock? Any suggested fixes. Just bought the boat a few weeks ago, other than this issue it runs great! Thanks Pat
    Probably, are you running cheap gas with ethanol? That's a no no..
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    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV - Sold
    2017 Moomba Craz - Enzos, Lead

  3. #3
    Join Date
    Jun 2009
    Location
    South West Colorado
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    764

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    Quote Originally Posted by Patrick Sedlak View Post
    On lake Norris TN today, temps in the high 70, ran boat most of day, let boat sit for 45 minutes, tried to start back up & ran very rough...coughing etc, shut it off, opened engine compartment for an hour, came back, started right up & ran fine. Could this be vapor lock? Any suggested fixes. Just bought the boat a few weeks ago, other than this issue it runs great! Thanks Pat
    Definately vapor lock. All you need to do is keep an empty water bottle on the boat. Fill it with lake water and pour on fuel pump. I do that twice and I'm good to go.

    If I know I'm going to be sitting for a while, I will let the fan run for quite a while and even open up the engine hatch to let the heat escape, if it's not too inconvenient.
    '08 Mobius LSV- SOLD!
    2017 Mojo Pro

  4. #4
    Join Date
    Mar 2014
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    Park City, Utah
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    1,291

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    Quote Originally Posted by moombahighrider View Post
    Definately vapor lock. All you need to do is keep an empty water bottle on the boat. Fill it with lake water and pour on fuel pump. I do that twice and I'm good to go.

    If I know I'm going to be sitting for a while, I will let the fan run for quite a while and even open up the engine hatch to let the heat escape, if it's not too inconvenient.
    Fans are cheap, we would run the fan from the time we launched to the time we loaded. Also, found this really helped on my 06 LSV, the fuel pump and oil lines were touching each other. took zip ties and pulled the oil lines away from the fuel pump, even that 1/2 inch space helped.
    2017 Centurion Ri237
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  5. #5
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
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    14,071

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    You might still have some of last year's fuel too. A few new tanks and it might get a lot better. Some stabil might help.
    My Mom said I'm not allowed to get wet!
    2008 LSV (sold)
    2000 Outback LS (sold)
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  6. #6
    Join Date
    Aug 2008
    Location
    Hilliard, Ohio
    Posts
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    Could be old gas + heat that lead to vapor lock. On our 06 LSV and 07 XLV we had to run the blower to keep it from happening. We used to get it once a season on Norris as I'm head headed. It was usually when we would run a long distance then dock or drop anchor. We have done the water bottle or when pulling into the no wake for the marinas flip the blower on. What part of Norris are you on? We are on the north side by the cedar creek bridge (aka jump bridge)

  7. #7
    Join Date
    Oct 2016
    Location
    Tims Ford Lake TN
    Posts
    318

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    Happened to my buddy as well on his 2007 LSV. I think he remedied the problem for good by getting some type of insulating / heat reflecting tape or wrap on the fuel line.
    2016 Mojo Surf
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  8. #8
    Join Date
    Apr 2013
    Location
    Knoxville TN
    Posts
    1,656

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    There are some thread on here and on the Supra site about installing a different fuel pump. Common issue. I used a water bottle to get moving again.
    It happened to me 3 years ago and I stopped using Eth Gas. No locking. Plus, I keep the blower on when pulling people or surfing.

    I would follow the advise of running 1-2 tanks of fuel thru it. Then swap out the fuel filter.

  9. #9
    Join Date
    May 2010
    Location
    Salt Lake City, Utah
    Posts
    1,231

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    Vapor lock for sure, I get it all the time on my 07 LSV. Like what was said above, use a cold bottle of water on the fuel pump and you are good to go. I tried heat shield and didn't help at all. I added a 2nd fan at the end of last year and have not tried it out yet but hope it will help a little. It's an inconvienence to have to dump water on the fuel pump but it just take a second or two.
    Scott
    2007 Mobius LSV with a lot of great upgrades and mods. Gone
    2021 Craz being built. Waiting patiently.......NOT!

  10. #10

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    Thanks for the reply. This was our first trip with our Moomba, just bought it. Can u shoot a picture of the fuel pump. Think I located it, it is a round calendar right?

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