Honda GC160 Owner's Manual page 23

Fuel system damage or engine performance problems resulting from
neglected storage preparation are not covered under warranty.
You can extend fuel storage life by adding a gasoline stabilizer that is
formulated for that purpose, or you can avoid fuel deterioration
problems by draining the fuel tank and carburetor.
ADDING A GASOLINE STABILIZER TO EXTEND FUEL
STORAGE LIFE
When adding a gasoline stabilizer, fill the fuel tank with fresh gasoline.
If only partially filled, air in the tank will promote fuel deterioration
during storage. If you keep a container of gasoline for refueling, be sure
that it contains only fresh gasoline.
1. Add gasoline stabilizer following the manufacturer's instructions.
2. After adding a gasoline stabilizer, run the engine outdoors for 10
minutes to be sure that treated gasoline has replaced the untreated
gasoline in the carburetor.
3. Stop the engine.
DRAINING THE FUEL TANK AND CARBURETOR
Gasoline is highly flammable and explosive, and you can
be burned or seriously injured when handling fuel.
• Stop engine and keep heat, sparks, and flame away.
• Refuel only outdoors.
• Wipe up spills immediately.
1. Use a syphon pump (commercially available) and syphon the fuel
out of the fuel tank into an approved gasoline container.
2. Place an approved gasoline container below the carburetor, and use
a funnel to avoid spilling fuel.
 WARNING
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