Kohler 15 hp Command - Carb Leaking

Old 09-10-09, 05:57 AM
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Kohler 15 hp Command - Carb Leaking

I have a 10 year old Scotts branded mower with a Kohler 15 hp Command engine. I have noticed the gas tank loses gas while the mower is sitting and discovered the carb is leaking -- gas drips off the bottom of the bowl of the carb after it has set a while.

I don't think the fuel line is leaking at the connection to the carb.

I removed the air cleaner element and noticed the curved air inlet part of the carb was full of fuel. If I start the mower this fuel is apparently drawn into the carb and a lot of white smoke comes out the exhaust. Once started, the mower works fine and the carb doesn't leak -- I assume any leaking fuel is being sucked into the combustion chamber while the engine is running.

Any idea what the problem is? Failed gasket, bad internal valve, etc.?

Old 09-11-09, 01:12 AM
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The needle valve in the carb is leaking. Replace the needle, clean the seat with a q-tip, and do not run the engine until you change the oil. The oil is most likely thinned down with gas (not a good lubricant).

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