Mercruiser 305 flooding at idle

P

pike hunter

Seaman
Joined
Nov 8, 2004
Messages
58
I don't post often but read on a regular basis and found very great knowledge on the site.<br />Thanks in advance to take the time to answer.<br /> :) My Mercruiser 305 1992 with a Alpha one. The motor is prone to flood at idle or trolling. I read the Mercury service bulletin # 97-8 and they recommend some verifications that I did on the week-end. The recommandations are: to put the spring loaded needle and seal kit # 3302-9029 and the other thing is to change the Venturi cluster # 421, what is on actually is the 407. Would like to know if the 407 run leaner then the 421 and also should I go for the 2 changes or try the spring loaded needle first?
 
C

cneste

Seaman Apprentice
Joined
Aug 18, 2004
Messages
46
Re: Mercruiser 305 flooding at idle

Sounds like a stuck float in the fuel bowl. I dont know if this would work like a car but her goes ( use to clean my holley 4 barrel like this)<br /><br />I would disconnect the throttle linkage to the carb. I would start the engine and rev it up a few thousand rpms(3-4) and try spraying a carb cleaner down the opening on the top of the carb and then try to suffocate it by putting a rag over the throat until it almost stalls. Repeat the process several times. Of course I would do this in the water so you wont burn out the impeller. Does anyone agree??<br />Chuck
 
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