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Carburetor flooding |
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Jonny Quest 
Grand Poobah 
Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2974 |
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 Topic: Carburetor floodingPosted: July-28-2019 at 12:35pm |
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Debris clogging the needle/seat.....It's happened to many of us. I had it happen on an almost new QuickFuel M-600 carb. Replaced needle/seat with free-bee from Q.F. Good to go for many more hours.
Glad you found and fixed your problem quickly. Happy boating. JQ |
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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trice
Groupie 
Joined: September-26-2016 Location: Columbus, Ohio Status: Offline Points: 87 |
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Posted: July-28-2019 at 12:19am |
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Completed the cleaning as described. Left the float setting alone. Test run was smooth. Problem solved, thx KENO!
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87 SN
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KENO
Grand Poobah
Joined: June-06-2004 Location: United States Status: Offline Points: 11093 |
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Posted: July-27-2019 at 9:26pm |
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Make sure you remove the float so you can pull the needle out of the seat assembly, then remove the seat assembly and blow out the bowl inlet passages with air,
Float adjustment on this style is a small tab that rides against the needle. You bend the tab Your old Holley book should cover that but being the rear bowl I don't think you'll have to adjust it, especially since you had 10 good running hours. It didn't magically get bent out of adjustment  Another kinda really slim possibility would be the float having a hole in it and filling up with gas |
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trice
Groupie
Joined: September-26-2016 Location: Columbus, Ohio Status: Offline Points: 87 |
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Posted: July-27-2019 at 8:41pm |
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Regarding filtering, I’m using an inline screen at the carb inlet and the original fuel water separator.
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87 SN
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trice
Groupie
Joined: September-26-2016 Location: Columbus, Ohio Status: Offline Points: 87 |
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Posted: July-27-2019 at 8:19pm |
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Hi KENO,
It just started flooding. The boat was just put in the water two weeks ago after a partial restoration and was running good (just under 10 hrs). I hope I find some junk in the bowl/needle (just pulled into the parts store for some carb cleaner). I’ve adjusted floats with center needles and bowl sight plugs but never this type, any tips? I do have an old Holley book to reference... Thanks for the reply, I’ll repost with findings and test run results. |
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87 SN
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KENO
Grand Poobah
Joined: June-06-2004 Location: United States Status: Offline Points: 11093 |
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Posted: July-27-2019 at 7:38pm |
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Has this been doing it since the rebuild? or did it just start sometime after?
Could be junk between the needle valve and seat holding it open leading to your flooding. Make sure the float is adjusted right, but it would have to be really high to make the back bowl overflow I'd figure the needle and seat is probably the issue. Do you have a filter somewhere in the system so it doesn't happen again after the cleaning? |
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trice
Groupie
Joined: September-26-2016 Location: Columbus, Ohio Status: Offline Points: 87 |
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Posted: July-27-2019 at 6:54pm |
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Original (recently rebuilt) carburetor on a 87 SN is flooding from both secondary boosters when engine is running. The engine runs poorly while this is occurring. Is this caused by a stuck needle valve or maybe a clogged passageway? Removing carburetor to investigate and to refresh rear bowl and needle valve. Any other tips or suggestions? Thx
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87 SN
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