The key to getting water out of the tank is to take a suction on the very bottom of the tank. The fuel pickup for the engine does NOT go to the bottom of the tank.
Access to the bottom of the tank varies from boat to boat. With my Tartan 30, I could get a piece of copper tube (about 6' long) in through the fill and to the bottom. I would then use a hand pump and pump into a gallon jug.
In these days of alcohol fuels, I found comfort in doing this once a year. No need to pump the tank dry - just get the water out of the bottom.
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