ORIGINAL: Antique
He said the carb was rebuilt...
The pump flappers don't keep the fuel in, they're on the other side of the carb..
The fuel in the carb is contained in the other side, under the diaphragm..If fuel leaks back out it's because the needle is leaking, not the flappers...
Looks like Antique had the right answer!!! Way to go! Capt,n[)]