Mercury - Low Pressure Electric Fuel Pump Gen III Cool Fuel Marine Engine Component 866170T01. Overview. Anyone who's spent long days on the water knows the engine only runs as well as the fuel system feeding it. When the fuel flow is steady, the boat feels alive - crisp throttle response, smooth idle, effortless acceleration. Mercury Marine part number 866170T01 delivers that kind of confidence. This low-pressure electric fuel pump supports your engine the same way a good deckhand supports the