This is about as far from CFB as it gets.
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Fellow dropped it off, said it would start but would not stay running. Looking at the fuel lines, they all appeared to have been replaced not so long ago.
Pushing the primer (purge bulb) would squirt fuel back out the carburetor. Remove the carburetor and pressure test - checks out O.K....let's have another look at those fuel lines. From the tank to the inlet of the primer, from the outlet of the primer to the (should be outlet) of the carburetor, from (should be inlet) of the carburetor back to the tank...all three lines were wrong . Correct the plumbing and the saw runs again.
Mark