Honda GC135 Owner's Manual page 40

HELPFUL TIPS & SUGGESTIONS
2. Loosen the carburetor drain screw, and drain the carburetor into an
approved gasoline container. After draining is completed, tighten
the carburetor drain screw.
Gasoline is highly flammable and
explosive.
You can be burned or seriously
injured when handling fuel.
Keep heat, sparks and flame away.
Handle fuel only outdoors.
Wipe up spills immediately.
CARBURETOR