Just got my Stihl last Friday. It cut very well until last Wednesday. The saw just cut out on me mid cut. I tried to start it and when you would give it gas it would just die. The primar ball will not take gas into it and when you press it you can hear air escaping from some where. The air filter is not gummed up, and it ran when I took it off in the garage. I took it back to the dealership. Anyone know what could be up? Owners manual suggests that I check the muffler for obstructions that would not allow the exhaust to escape. Also states that the screen in the fuel tank could be clogged. I find this hard to believe since I had only cut 4 times with the saw before it went down. Any help is appreciated.