Set the choke to the "On" position and try to start the engine.
Unscrew the cap on the fuel tank then look inside the tank. Replace the fuel if it looks like there is water inside, the fuel appears dirty or the snow blower has not been operated since last season. Fill the tank to the fill line.
Wiggle the spark plug wire to make sure it is connected securely to the spark plug.
Unscrew the spark plug with a wrench and inspect the end for rust.
Locate the fuel shutoff valve near the fuel line. Make sure it is in the "Open" position. Check the fuel line by unscrewing the clips that hold it in place. Pull the fuel line off and look inside for clogs. Replace the fuel line if necessary.
Move the throttle to the "On" position if it is turned off.