Do not and I will repeat DO NOT EMPTY THE FUEL/WATER SEPARATOR!! If you do you will most probably cause your engine to air lock. The correct procedure is to drain about two teaspoons off into a clear container or plastic baggie and visually inspect for water and like everyone else is saying most of us do it very seldom. Myself I probably check mine once or twice a year.
Brian, Loretta & Daisy (Golden Retriever)
2008 Holiday Rambler Endeavor 40 PDQ , ISL 400
2014 Ford Explorer toad