Honda BF15D Owner's Manual page 90

STORAGE
2. With the outboard motor in a
vertical position, place an
approved gasoline container below
the fuel drain outlet, and use a
funnel to avoid spilling fuel.
Loosen the drain screw to drain
fuel from the carburetor.
Gasoline is highly
flammable and explosive.
You can be burned or
seriously injured when
handling fuel.
Stop the engine and keep
heat, sparks, and flame
away.
Handle fuel only
outdoors.
Wipe up spills
immediately.
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3. After the fuel has drained from the
carburetor, tighten the drain screw
securely.
4. Drain the portable fuel tank into an
approved gasoline container, or if
you need to store fuel in the fuel
tank, you can extend fuel storage
life by filling the fuel tank with
fresh gasoline and adding a fuel
stabilizer that is formulated for
that purpose. Firmly close the fuel
cap vent knob.
Store portable fuel tank in a cool
place.