Not meaning to say you don't know what your doing so this is just an idea. Did you install the pump with the push rod up into place? Second, it is quite common for the gas line from the tank to the pump to clog up with crud. As Roy said make sure it is open. Good luck, get her on the road!

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)