Briggs & Stratton 100000 Operator's Manual page 14

Storage
At the end of the season, or whenever the unit will be stored for
30 days or more, follow the storage checklist below.
WARNING
Gasoline is highly flammable and its vapors are explosive.
Fumes may travel to a distant ignition source and an explosion
and/or fire could result.
• If there is fuel in the tank, do not store the unit indoors or
in a poorly ventilated area where fumes could reach
sparks, open flames, pilot lights, heat, and other ignition
sources.
Engine:
Fuel can become stale when stored more than 30 days. Stale
fuel can cause acid and gum deposits to form in the fuel system
and the carburetor. To keep fuel fresh, add Briggs & Stratton
Advanced Formula Fuel Treatment & Stabilizer.
• There is no need to drain the fuel from the engine if a
stabilizer is added according to instructions. Run the engine
for 2 minutes to circulate the stabilizer throughout the fuel
system. If no stabilizer is added, the fuel must be drained
from the engine into an approved container. Then run the
engine until it stops from lack of fuel.
• While the engine is still warm, change the oil. See Changing
the Engine Oil.
Snowthrower:
• Ensure all nuts, bolts, and screws are securely fastened.
• Inspect all external moving parts for damage and wear.
Replace parts as necessary.
• For unpainted or bare metal surfaces, apply a rust
preventative product.
• Store the unit indoors and cover it.
• If the unit must be stored outdoors, cover it with a heavy
tarpaulin.
Returning the Unit to Service:
• Have an authorized service dealer perform annual
maintenance tasks. See Maintenance Schedule.
• Check the engine oil level and add oil if necessary.
• Check unit for debris around the muffler and cylinder areas.
• Fill the fuel tank with fresh, clean fuel.
• Ensure all guards, shields, and covers are in place.
• Test the auger control.
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