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what causes my saw to cut out after running for a short time?

what causes my mc cullough 441 saw to cut out after running for a short time? Then when you try to restart it will not start.
noel garlick, March 2009
try a new tank vent, the saw will run until a vacuum on the fuel is created. Then the line becomes vapor locked, forcing you to wait several hours before being able to restart.

just me, March 2010
Had exactly the same thing with one I acquired from a car boot sale

the tigers, March 2009