Your issue is most likely a combination of issues:

I am not an expert about fuel pumps, but I am sure there is some leakage back down the fuel line to the fuel pump due to gravity after the pressure in the fuel lines from the pump disipates.

The other is a bit better established from a "science" perspective. The vapor pressure of today's fuels is a far cry from what it was when these cars were built. So our carbs "dry out" if they are not started for a couple of days because they fuel systems are "open" to the atmosphere.

Today's fuel injections systems are "closed" so 1) fuel pressure does not bleed off very fast at all, and 2) there is little evaporation allowed anymore as that's bad for air quaility. In addition, when you turn the key to "run" before you turn it to "start" you may notice that the fuel pump energizes the system even before the motor starts turning over.

Thus the reason why you have probably to crank your FGF over a bunch before it fires here in the "modern age". Unless you have an electric fuel pump.