it is an off-the-shelf Rule 500 GPM pump, located forward of the battery. Check that the wiring is not backwards, i.e. brown to black and vice versa instead of brown to brown, black to black. It's a quick fix either way, just cut the plug off the old one and solder it to the new one, or use heat shrinkable crimp connectors. All available at a marine store. The pump snaps into a blue plastic holder screwed to the hull liner.