A functioning bilge pump.
In our 25’ Nordic I/O 50 miles up lake at the back of Anasazi Cyn, discovered water on floor. Opened engine hatch, discovered seawater pump housing was cracked and filling the boat with water.
No problem, flipped on the 25 yr-old bilge pump...nothing. Got that ‘sinking feeling’ (literally).
High-tailed it to DR and pulled up just as the fuel dock was closing. Found a bilge pump for double the cost (but worth every penny). MacGuyver’ed the pump off the battery using some scavenged stereo wire. Rigged it to Automatic and safely made it back to Wahweap.
Lesson learned: Check that bilge pump regularly, it could save your life.