seawater

Hello, Need some help...there appears to be a leak around the diaphragm foot pump that pumps in raw seawater. The leak may be coming from the connection of the hose to the pump or perhaps a hole in the diaphragm - given the lack of resistance I find when exercising the foot pump, my guess is...

Engine wouldn't start last fall,after running fine all summer. I tried many times but it wouldn't turn over. Left it in water over the winter with heater in cabin, bubble system outside. Mechanic said seawater in engine, needs cylinder, piston, piston sleeve, manifold rotted, elbow fitting...