Thread: Emptying an underfloor tank

This is a common problem on moored boats. Best (but sorta expensive) way to mitigate it us to keep the tanks full - this prevents the condensation that produces the water.

Originally Posted by Tentman

This is a common problem on moored boats. Best (but sorta expensive) way to mitigate it us to keep the tanks full - this prevents the condensation that produces the water.

And any steel farm tank. I have an old 1000L tank, the mechanic in me hates the idea of the rust and water forming inside it, but keeping it full defeats the purpose or having it. Two good quality filters give piece of mind especially when it empties and you see how much rusty sediment is caught by the first filter/water bowl.

If you have fuel, you probably have water. A drain tap on the lowest part of the tank is really the best solution if it's going to be a while between trips if that's possible. Otherwise just keep good quality filters and emptying the separator bowl.