Thanks Redstroker, I'll get one too!
My 97 has the yellow valve on the side of the fuel filter housing, it is the water seperator valve. Any water in the fuel is trapped there and is removed when you drain it. (along with some fuel) when it gets empty it stops. Of course if you have water in the fuel tank etc. then removal of the tank and clean is probably the way to gois that the inline one?? cause i know my truck has the little nob but that doesent drain water???