Larry,
thanks for the detailed reply and I am sure that you know more about carburetor than I'll ever know.
Most of us understand the concept of carburetors under normal operating conditions.
The entire thread is dealing with an unusual condition possibly involving a defective carburetor.
Unfortunately we'll never know since the OP has replaced the carb and the hot starting symptoms have disappeared.
The carb may have only needed a new float as per the following SB issued by Marvel Schebler.
http://msacarbs.com/pdf/MSA-13.pdf
In case you don't want to read the whole bulletin:
The bulletin does not go into detail as to why it is flooding but I have explained those reasons in detail. Vapor in the float bowl causes the same kind of problems.
And for those who lean the mixture on take off at sea level, I think you are masking a problem with the carburetor or a hot fuel issue. A properly functioning carb does not have to be leaned at seal level to keep the engine from dying.
I fully understand that the float bowl is vented but the vent hole is
about .005 " (correct me please) you supply fuel at a pressure of 4 to 5 psi to an "almost" closed system (except for .005" vent hole idle mixture channel and
mixture channel) and a 3/8" fuel line capabable of delivering 45 GPH,you will pressurize the bowl unless the float closes the inlet valve causing the flooding at idle or hot start or even cold starts.
What say you Larry?
I hate to argue by myself
thanks for the detailed reply and I am sure that you know more about carburetor than I'll ever know.
Most of us understand the concept of carburetors under normal operating conditions.
The entire thread is dealing with an unusual condition possibly involving a defective carburetor.
Unfortunately we'll never know since the OP has replaced the carb and the hot starting symptoms have disappeared.
The carb may have only needed a new float as per the following SB issued by Marvel Schebler.
http://msacarbs.com/pdf/MSA-13.pdf
In case you don't want to read the whole bulletin:
In the case of the advanced polymer floats, there is also a possibility of leaks through the welded seam. This allows a portion of the float to fill with fuel and thereby reduce the buoyancy of the float, which could lead to
flooding or poor idle performance.
The bulletin does not go into detail as to why it is flooding but I have explained those reasons in detail. Vapor in the float bowl causes the same kind of problems.
And for those who lean the mixture on take off at sea level, I think you are masking a problem with the carburetor or a hot fuel issue. A properly functioning carb does not have to be leaned at seal level to keep the engine from dying.
I fully understand that the float bowl is vented but the vent hole is
about .005 " (correct me please) you supply fuel at a pressure of 4 to 5 psi to an "almost" closed system (except for .005" vent hole idle mixture channel and
mixture channel) and a 3/8" fuel line capabable of delivering 45 GPH,you will pressurize the bowl unless the float closes the inlet valve causing the flooding at idle or hot start or even cold starts.
What say you Larry?
I hate to argue by myself