Won't start - Poulan 25CC Gas BlowerVac

This is probably a fuel delivery issue and the usual cure is inspection and /or replacement of all fuel system parts from the in tank fuel filter, fuel line, and carburetor parts. Rebuild kits and diaghram (carb) kits are available and not too expensive. Otherwise this could be an ignition issue whereas there isn't enough spark.The engine could be low on compression and would never start. A severe carbon build up in the engine and muffler can cause issues also...but usually its the carburetor needs service.