long time ago I saved a boat from sinking with engine raw water pump, a lot of water inside the Grand Banks all battery service under water so no move energy for bilge pump, by chance I started main engine crankshaft was under water you can imagine the emergency to pump aout, boat was a mooring.
when engine was started I cut hose near through hull and closed the valve... after that full RPM and Lehman and after 2 hours boat was back at live !
Any way installed a 3 way valve on the hose from through hull to engine are a very nice way
Hugues
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