What kind of fuel pump?
Electric or Mech.?
Do you have the in and out lines right?
How long was it off the car when switching it and was there still fuel in it?
Are you sure that fuel pump will work with this motor.
Was the pump button that pumps the arm installed in this motor?
Got any gas in the tank? I know some stupid questions, but hey ya never know right.
Lots of pumps won't pump water either so if there is water in the bottom of the tank it might not pump it out. Try taking off the line that come from the tank and see if any gas comes out, before it gets to the pump.
Good Luck!!! Kurt