Turn off the snow blower and remove the key from the ignition. Locate the spark plug wire and disconnect the wire from the spark plug, using your fingers.
Locate the fuel shut-off valve under the engine. Turn the valve counterclockwise with your fingers.
Place a drain pan under the fuel shut-off valve.
Locate the hose clamp that secures the fuel line to the shut-off valve. Loosen the clamp with a screwdriver and slide the fuel line off the valve.
Open the fuel shut-off valve by turning the valve clockwise. Allow the gas to flow into the drain pan until the gas tank is empty. Dispose of the old gas according to your local regulations.
Close the fuel shut-off valve by turning it counterclockwise. Attach the fuel line to the valve and install the hose clamp. Tighten the clamp with a screwdriver.
Attach the spark plug wire to the spark plug, using your fingers.