Honda HS1810Z Owner's Manual page 41

Gasoline is extremely flammable and is explosive under certain
conditions.
Refuel in a well-ventilated area with the engine stopped.
Do not smoke or allow flames or sparks in the area where the
engine is refueled or where gasoline is stored.
Be careful not to spill fuel when refueling. Spilled fuel or fuel vapor
may ignite. If any fuel is spilled, make sure the area is dry before
starting the engine.
Avoid repeated or prolonged contact with skin or breathing of
vapor. KEEP OUT OF REACH OF CHILDREN.
Gasoline substitutes are not recommended; they may be harmful to
fuel system components.
Gasoline spoils very quickly depending on factors such as light
exposure, temperature and time.
In worst cases, gasoline can be contaminated within 30 days.
Using contaminated gasoline can seriously damage the engine
(clogged carburetor, stuck valve).
Such damage due to spoiled fuel is disallowed from coverage by the
warranty.
To avoid this please strictly follow these recommendations:
Only use specified gasoline (see page
Use fresh and clean gasoline.
To slow deterioration, keep gasoline in a certified fuel container.
If long storage (more than 30 days) is foreseen, drain fuel tank and
carburetor (see page
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