Honda HRR216VXA Owner's Manual page 40

STORAGE
5. After the lawn mower is clean and dry, touch up any damaged paint
and coat other areas that may rust with a light film of oil. Lubricate the
control cable cores with a silicone spray lubricant. (page 56)
Fuel
Gasoline will oxidize and deteriorate in storage. Old gasoline will cause
hard starting, and it leaves gum deposits that clog the fuel system. If the
gasoline in your mower deteriorates during storage, you may need to
have the carburetor and other fuel system components, serviced or
replaced.
The length of time that gasoline can be left in your fuel tank and carburetor
without causing functional problems will vary with such factors as gasoline
blend, your storage temperatures, and whether the fuel tank is partially or
completely filled. The air in a partially filled fuel tank promotes fuel
deterioration. Very warm storage temperatures accelerate fuel
deterioration. Fuel deterioration problems may occur within a few months,
or even less if the gasoline was not fresh when you filled the fuel tank.
The Distributor's Limited Warranty (page 57) does not cover fuel system
damage or engine performance problems resulting from neglectful
storage preparation.
You can extend fuel storage life by adding a fuel stabilizer that is
formulated for that purpose, or you can avoid fuel deterioration problems
by draining the fuel tank and carburetor.
Adding fuel stabilizer to extend fuel storage life
When adding a fuel stabilizer (page 56), 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 fuel stabilizer following the manufacturer's instructions.
2. After adding a fuel 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, and turn the fuel valve to the OFF position. This turns
off the fuel flow between the fuel tank and the carburetor.
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