A long time ago, when I was a LOT younger, I was on a 33ft motor yacht with a group of workmates. We were on the way back to Lymington after a day trip to the Isle of Wight when the owner, my boss at the time, announced that there was something wrong and that the boat was getting sluggish.
After a while we stopped and lifted the engine covers to find about 200 gallons of water, boss's estimate, sloshing about. Outlet pipe had come off the engine. Pipe soon fixed. Pump out water.? ::)? Stirrup pump located in awkward position in aft cabin. One of the lads, we were all young then, was sent to operate the pump. After a few strokes off came one of the connecting hoses which were held on by jubilee clips. Water sprayed everywhere. Hose back on, more strokes, hose off again, more water everywhere.
By then, our boss had gone to see what the fuss was about. It would help if you opened the B+*%~>Y sea cock we heard him shout. After that we were soon on our way again. Brian, the pump operator, had a red face for a long time afterwards. We were not sure if it was embarrassment :-[ or the result of trying to pump water through a closed valve.
If it ain't broke, fix it till it is.