No Fuel Pressure after driving car.

Tank is in everything hooked up. With dry lines carb and fuel pump how much cranking do I have to do get fuel to carb and fuel pressure? Cranked it good 1 min every 20 seconds at a time and nothing. 5 gal in tank.
Did you verify the pickup tube reached the bottom of the tank after it was fully installed with the lock ring? If not it can be several inches off the bottom and thus there may not be enough gas in the tank