I don't understand how the fuel can drain back out of the carb, when the fuel inlet is above the fuel level. On the holley 1920 carb if the pump diaphragm is bad the fuel can leak to the outside of the carb
It just can’t empty the carb, no way no how.
It can only evaporate or leak.
It can however drain back what is in the fuel line.
If you have one that does both it compounds the problem.
My car has an electric pump so neither evap or drain back is a problem, but we have a 72 dart 318/two barrel that does both evap and drain back because it’s hardly ever driven.
That one is pretty much all stock, so it will stay the way it is for now.
A short shot of fuel in the carb and it fires right up.
