The raw water pump is designed to use the water is pumps to lubricate its impeller. Do not run the engine unless the boat is in water or hooked to a Fake A Lake. If you run the engine with the boat without a water source the water pump may be damaged, causing your engine to overheat.
PCM replacement part which fits MasterCraft Boats with a PCM 351 Ford engine. Will also fit an almost all PCM/Ford applications. Nothing like an overheated engine to ruin your weekend on the water. It is recommended that you change your impeller annually or every 100 hours (whatever happens first) and keep a spare in your boat. Natural wear and debris in lake water tear away at your impeller, eventually to the point where the raw water pump can't keep up with the heat output of the engine. This leads to engine overheating which can lead to engine failure.