I really doubt it is the impeller, that should not cause a leak into the boat. More likely it would cause over heating problems. It is either the shaft packing, rudder or also check the hose clamps around the exhaust. I had one that was loose and was allowing water to enter the boat. You can check to see if it is the exhaust part by running the engine and seeing if the water in the hull is warmer than the lake water.
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