put 2-3 oz. of seafoam in gas tank; now won't start/dies

[5th_bike]

Right on, when filling and you look down and you stop when the gas touches the bottom of the rim around the fuel cap, it's full.

BTW I never put anything in the gas, and it always runs, even when unused for a couple weeks. But I do try and run it with no more than three weeks in between. Recently it sat unused for more than a month, and it still worked fine. I do believe though that when you don't use it for say three or four months, your carb wil gunk up. But not in two or three weeks.