71 Duster 318 fuel pump not pulling fuel from new gas tank

It takes a long time to get gas to the carburetor from a dry system. Here's what I do. Remove the gas cap and apply a small amount of shop air to the filler. Just use a shop rag to seal the air blower best you can. Do this several times. You can tell when you get gas since you have a clear filter. Just do it gently, as you don't want to over pressure and hurt anything. I always turn my regulator down to about 10psi. You don't have to do that if you're careful.