Posted by Owen Aaland on January 01, 2013 at 05:48:07 from (216.47.35.195):
In Reply to: Frustration posted by Zachary Hoyt on December 31, 2012 at 18:50:50:
Quoting Removed, click Modern View to see
That is a very good description of how an updraft carburetor engine acts when the gas has had the most volatile parts evaporated off. The gasoline that is left will still run fine once the engine is running because the air moving past the idle port and venturi is moving fast enough to vaporize the fuel. At cranking the air speed is so slow that the fuel just dribbles out, and with the most easy to vaporize parts no longer in the mixture, remains as a liquid and is not drawn into the engine.
Fuel blended for summer use will also act the same way when the weather gets colder.
When my Super C and 2444 start to act like this I just give them a shot of Brake Clean before trying to start them. The Brake Clean vaporizes very quickly since that is what it is designed to do. Once started the engines run fine.
Adding enough fresh gasoline to have 10% - 20% mixture is usually enough to cure the problem until it also suffers from evaporation. About three months is the longest my tractors will go without adding fresh fuel before this problem starts to occur.
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