holley 1945 losing its prime

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.
not a fan of electric fuel pumps and id only run one if it was set up to switch that tun off pump in event of a wreck!! and still only if going efi witch i just ant doing! if check valve dont help might be time to try out a 2 bbl carb!