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Thread: Air sucking sound/stall?
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05-26-2013, 10:12 PM #1Member
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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
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05-27-2013, 01:16 AM #2
Air sucking sound/stall?
Vapor lock?
Last edited by moombahighrider; 05-27-2013 at 01:19 AM.
'08 Mobius LSV- SOLD!
2017 Mojo Pro
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05-27-2013, 11:01 AM #3Senior Member
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Re: Air sucking sound/stall?
Bilge pump?
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2002 Moomba Mobius LSV - Sold
2006 Moomba Mobius LSV - Sold
2017 Moomba Craz - Enzos, Lead
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05-27-2013, 10:52 PM #4
Only guy I've heard of lately complaining of too much sucking.
My Mom said I'm not allowed to get wet!
2008 LSV (sold)
2000 Outback LS (sold)
LLTR!!!!!!!!
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05-28-2013, 02:37 PM #5Member
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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
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05-28-2013, 02:54 PM #6Senior Member
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2002 Moomba Mobius LSV - Sold
2006 Moomba Mobius LSV - Sold
2017 Moomba Craz - Enzos, Lead
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05-28-2013, 03:39 PM #7Member
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06-06-2013, 08:25 AM #8Senior Member
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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
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06-06-2013, 10:44 AM #9Senior Member
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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..
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2002 Moomba Mobius LSV - Sold
2006 Moomba Mobius LSV - Sold
2017 Moomba Craz - Enzos, Lead
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06-06-2013, 09:45 PM #10