I don't remember the p/n. It was a round MARINE low (5psi) pressure fuel pump. About 2" dia., about 3" long. Been working for 3 years so far. I have heard that the Merc unit is rebuildable, but have not tried it.
Before spending $$, make sure you have power at the pump. This pump normally only runs about 30 seconds at startup. Sucks gas from tank to engine-driven pump, then shuts off.