This just got much simpler... I see four potential issues since you can hear the pump.
A) There's no gas.
B) The line is plugged, pinched, or otherwise obstructed very near the tank.
C) The fuel line that attaches to the pump inside the tank is off, plugged, pinched, or otherwise obstructed.
D) Something is wrong with the new pump.
“The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed.” ― Robert M. Pirsig, Zen And The Art Of Motorcycle Maintenance: An Inquiry Into Values