take hose off carb and put into a bowl and turn engine over and see if it pushed any thru.
Also try pulling the inlet hose off from the pump and put into a bowl of fuel and see if it pulls any through and into that bowl before the carb.

That is to check if the pump is working and to see if the needle and seat is working in the carb.
Its meant to pump a LOT of fuel.

Let us know what you find

EDIT: frank just got in there.
Also, did you check the arms on the fuel pumps were the same length? If you put the wrong one in it wont be pumping properly