Mercruiser 350 250hp rough idle "smoke vapor Carb"

bdirect

Seaman
Joined
Mar 4, 2004
Messages
67
Was running the boat today 24ft cuddy. Boat ran great 2 plus hours. Ran back 20 minutes to the dock at WOT when I slowed down i immediatly noticed engine was rough. Took the boat back out and seems to run fine (well no power loss)<br />Sat tied up at the dock at idle for a good 20 minutes when i got in never even hinted at stalling. I opened up the engine compartment and noticed what looked like an occasional wisp of smoke or vapor coming from the breather on the carberator. All guages read normal while running and while tied up at idle. We have had torential downpours and very wet weather for 2 days as well.
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: Mercruiser 350 250hp rough idle "smoke vapor Carb"

fix the leaking float/needle seat. your seeing excess fuel boiling in the intake manifold
 

bdirect

Seaman
Joined
Mar 4, 2004
Messages
67
Re: Mercruiser 350 250hp rough idle "smoke vapor Carb"

rodbolt. I thought you might say that! I will fix tommorow...thank-you
 
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