Quite often a fuel pump makes noise (cavitates) due to fuel starvation.  I
had that problem, changed pumps several times, and finally dropped the fuel
tank. It contained a lot of scale which was clogging the lines and starving
the fuel pump.  Cleaned the tank, replaced the old vent lines, and have not
heard my fuel pump since.

Good luck,

Warren
88 Westy "Billy Bones"