water in tank problem

[darrsi]

I had to purge my tank of petrol before hitting it with a grinder, I removed the fuel tap, cap and fuel level sender, steam cleaned it then sat it in front of my fan heater for a few hours, was bone dry when finished., may be a little extreme for what you need but it will remove all the water

99% Isopropyl Alcohol will soak up water in your tank and burn it off as fuel, and is a damn sight less kerfuffle.