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Several reasons to have and several to not have a bilge pump in a 13 Whaler. If you trailer your boat there is really no need for a pump. If you get water in the boat just lean back, pull the drain plug and get up on a plane and the water will drain out. If you store your boat in the water you don't really need a bilge pump. Just leave the plug out and it will fill with an inch or two of water and no more. Any more water added in whatever manner will just drain out and that one or two inch level will be constant. When you get to the boat put it on a plane and the water will drain then put in the plug. Some people don't want wet feet and opt for a bilge pump. Rule makes a 500 GPH pump that has a built in sensor which turns it on if it detects water. I've had one of those in my Montauk 17 for three years and I'm happy with it.