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  1. #1
    Join Date
    Apr 2009
    Location
    Raleigh, NC
    Posts
    41

    Default Air sucking sound/stall?

    Today was our first day out this year. The boat ran great for a few hours. We stopped for a bit to let the kids swim and have a snack. When I started it back up, there was a strange air sucking sound that seemed to be coming from the air intake - kind of like something was trying to suck in air but was restricted, or something that normally sucks in air but is muffled had the muffler removed. Also, if it didn't stall right after cranking, it would stall after giving it a little throttle. I took off the plastic cover and the flame arrester and tried cranking it. It made the same sound and wouldn't run long enough for me to go back to the engine after cranking it to inspect better. With it off, I opened the throttle all the way to make sure the valve inside was opening properly. Then, soon afterward (maybe the next crank) the sound was gone and it ran fine. I put things back together, and we probably ran for another 45 minutes or so without any problems.

    Any ideas what that sound could have been?

    Thanks.
    05 Mobius LSV - gravity 3 ballast and wake plate
    single axle trailer
    DIY hot water shower installed
    DIY tube inflator installed

  2. #2
    Join Date
    Jun 2009
    Location
    South West Colorado
    Posts
    348

    Default Air sucking sound/stall?

    Vapor lock?
    Last edited by moombahighrider; 05-27-2013 at 01:19 AM.
    '08 Mobius LSV, Mods- 1100 lb Rear Sacs, IBS Sac, Center 400 Sac, Dedicated thru-hull intakes and pumps per sac, SeaDek One Piece Mica over Black Roo, EZ Net Cargo Nets, Swivel Drivers Seat, Hot Water Shower, Hinged Wind Block, Bow Cushion Adapter Plate for Drink Holders Access, etc, etc.

  3. #3
    Join Date
    Aug 2011
    Posts
    1,028

    Default Re: Air sucking sound/stall?

    Bilge pump?

    Sent from my Nexus 4 using Tapatalk 2
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV

  4. #4
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    11,211

    Default

    Only guy I've heard of lately complaining of too much sucking.
    My Mom said I'm not allowed to get wet!
    2008 LSV
    2000 Outback LS (sold)
    Exile Tunes
    PWI
    LLTR!!!!!!!!



  5. #5
    Join Date
    Apr 2009
    Location
    Raleigh, NC
    Posts
    41

    Default

    It definitely was not the bilge pump.

    I've never had a vapor lock problem before. The lake and air temps were around 75, which makes me think that wasn't the problem. Can vapor lock cause that kind of sound? It was loud enough to be quite noticable.

    We took the boat out again yesterday and ran for 3-4 hours without any further problems.
    05 Mobius LSV - gravity 3 ballast and wake plate
    single axle trailer
    DIY hot water shower installed
    DIY tube inflator installed

  6. #6
    Join Date
    Aug 2011
    Posts
    1,028

    Default

    Quote Originally Posted by WolfpackRider View Post
    It definitely was not the bilge pump.

    I've never had a vapor lock problem before. The lake and air temps were around 75, which makes me think that wasn't the problem. Can vapor lock cause that kind of sound? It was loud enough to be quite noticable.

    We took the boat out again yesterday and ran for 3-4 hours without any further problems.
    Maybe it was all the money being sucked out your wallet?
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV

  7. #7
    Join Date
    Apr 2009
    Location
    Raleigh, NC
    Posts
    41

    Default

    Quote Originally Posted by parrothd View Post
    Maybe it was all the money being sucked out your wallet?
    Hmm, now that's a possibility. It's a good thing it stopped!
    05 Mobius LSV - gravity 3 ballast and wake plate
    single axle trailer
    DIY hot water shower installed
    DIY tube inflator installed

  8. #8
    Join Date
    Jun 2010
    Location
    Lake Houston
    Posts
    656

    Default Re: Air sucking sound/stall?

    That my friend sounds like good old fashioned vapor lock. Well, it sounds like tye engine isnt getting fuel. Now whether thats vapor lock or not I dunno. Does this only happen when you have already been running the engine or will it happen on the first crank of the day?
    2013 LSV
    2005 LSV - SOLD

  9. #9
    Join Date
    Aug 2011
    Posts
    1,028

    Default Re: Air sucking sound/stall?

    Lol... Sounds like a bad pump or filter I'd be replacing both.. Better to be safe and not ruin a weekend or having to get towed..

    Sent from my Nexus 4 using Tapatalk 2
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV

  10. #10
    Join Date
    Jun 2009
    Location
    South West Colorado
    Posts
    348

    Default Air sucking sound/stall?

    Quote Originally Posted by lewisb13 View Post
    Does this only happen when you have already been running the engine or will it happen on the first crank of the day?
    Before you replace anything, I think you should answer this question....

    I'm still in the vapor lock camp.
    '08 Mobius LSV, Mods- 1100 lb Rear Sacs, IBS Sac, Center 400 Sac, Dedicated thru-hull intakes and pumps per sac, SeaDek One Piece Mica over Black Roo, EZ Net Cargo Nets, Swivel Drivers Seat, Hot Water Shower, Hinged Wind Block, Bow Cushion Adapter Plate for Drink Holders Access, etc, etc.

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