Honda EU3000i Handi Owner's Manual page 46

SERVICING YOUR GENERATOR
When fueling an empty fuel tank, fill the tank up to the upper level
mark. The generator will not start if there is not enough fuel in the
tank.
FUEL FILLER CAP
After refueling, tighten the fuel filler cap until it clicks.
44
UPPER LEVEL MARK
(RED)
TETHER