Your engine needs compression, spark and fuel to run. You didn't say if the blower was running fine before you replaced the fuel line, filters and spark plug.
You can start by pulling the spark plug out and attach the plug to the spark plug wire, than ground the side electrode to the cylinder head and turn the engine over and see if there is a spark jumping across the spark plug gap. This is a good indicator if your ignition system is working properly, but it won't always tell you if its a healthy spark. When the spark plug is installed and its working under operation conditions, it becomes harder for the ignition system to produce a healthy spark across the spark plug gap, so its possible to see a spark with the plug out of the cylinder, but doesn't spark when its installed in the cylinder. This is rare....If you don't see a spark, than check the kill switch. If still no spark, than try another spark plug.