Purchased a used boat from a dealer with a 78 Merc 150. After taking it out on the lake to make sure everything worked fine, I noticed the previous owner had removed the fuel pump and replaced it with an external pump. <br /> The boat seem to run fairly well but the engine when given gas would stall slightly, then pick up normally. I can buy a used one at a dealer he has sitting around, (fuel pump for engine). But, I was wondering if there may be a greater reason the boat was given this external pump.....any ideas.....thanks