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 TANK CAP
Non-California types:
After refueling, tighten the fuel tank cap securely.
California types:
After refueling, tighten the fuel tank cap until it clicks.
44
UPPER LEVEL MARK
(RED)
TETHER
(California Type)