Be sure to test the pump before changing it. There are several reasons a fuel pump quits working, and simply swapping to a "new" pump won't solve problems like a clogged fuel line, a restricted gas tank vent, debris in the tank, and a lot of other problems. Plus, you might have to try several new overseas-manufactured pumps before you find a good one. See if the engine will fire up and run for a while by filling the carburetor float chamber through the vent pipe at the top of the air horn. With the float chamber full, the engine will idle for nearly a minute- - - -long enough to check the pump for pressure, vacuum, and volume.
Jerry