Small Engines (Lawn Mowers, etc.): leaf blower, air leak, air moisture

Question
I have a 28cc two cycle craftsman professional blower.  It starts great and runs great (at least for about 20 minutes).  I have had it just over a year and have loved it until the last three times I used it.  The first sign of a problem was when I held it vertical to blow webs off of my gutter and it cut out then would not restart.  It sounded as if it were not getting air.  It is easy to start and runs great for about 20-25 minutes then slowly dies sounding as if it ran out of gas.  This happens even if it is held horizontal during the entire time.

Answer
when this happens, try choking it a bit, does it run better?  If this is the case you have a fuel problem, more specifically lack of fuel.  Look for bad fuel filter, fuel line collapsing, bad gas in general.

Another possibility could be an air leak, but it doesn't sound like that.  An air leak is a seal, or a gasket that is leaking and allowing air to lean the fuel/air moisture out.