Yamaha EF6600DE Owner's Manual page 19

WARNING
9 Fuel is highly flammable and poisonous.
Check "SAFETY INFORMATION" (See page 3)
carefully before refueling.
9 Do not fill above the top of the fuel filter or it
may overflow when the fuel heats up later and
707-051
expands.
9 After refueling, make sure the tank cap is tight-
ened securely.
NOTICE
9 Immediately wipe off spilled fuel with a clean,
dry, soft cloth, since fuel may deteriorate
painted surfaces or plastic parts.
9 Use only unleaded gasoline. The use of leaded
gasoline will cause severe damage to internal
engine parts.
– 14 –