2. I'm sure you've heard the one about using your engine's raw-water intake as an emergency bilge pump? Don't do it. The pump will barely make an impact and there's the big risk of it getting clogged from the nasty bits in your bilge, leaving you sinking -- and without power. Carry an inexpensive, easy to stow, high output, uncloggable, manual diaphragm pump from Whale or Guzzler instead.