Specific to a 900ss-Shaun, look at the lower corners of the tank-they are below the pump intake. Any water will find its way down there, and the tank WILL rust out, ask me how I know....fixed mine with marine tank epoxy, but would prefer you not have to.
If you are storing the bike, I'd run her dry, then remove the tank and drain it by turning it upside down, then check for rust and if lucky, POR it. Or jsut buy a carbon tank
