dry gas makes it worse as i've been told,i had a partial tank i treated with stabil last fall,the 260 started and ran good this year.If you got real water in your tank it should show up my siphoning the bottom of the tank in a clear container.I thought mine was water but it turned out a stuck float and dirty carb from ethonal damage to lines.water seperator works but filters can only sevice so much water and then they dont work