I bet that even if it IS FLOWING enough, you can still suck a stock capacity bowl empty faster than it can fill

If is flowing enough, the fuel level in the float bowl will stay the same at all times.  If the flow bowl can EVER be sucked empty IT IS NOT FLOWING ENOUGH. 

A float bowl on a running engine could be compared to a water bucket with about 1/8" hole in the bottom.  If you want to keep the water level in the bucket at the EXACT same LEVEL at all times you have to be pouring new water into the bucket at the same rate as it is running out the BOTTOM.   It does not matter what size bucket you have if you want to maintain the same water level all of the time:             SUPPLY has to equal CONSUMPTION!

If the new water supply is less than than the leak in the bottom it just takes the large bucket longer to become empty than than a small bucket