Honda GL1800 2004 Owner's Manual page 132

filler neck
4. Add fuel until the level reaches the bottom of the filler neck.
Avoid overfilling the tank. There should be no fuel in the filler neck.
5. After refueling, be sure to tighten the fuel fill cap firmly by turning it
clockwise until it clicks.
6. Close the fuel fill compartment and turn the ignition key counterclockwise.
7. Remove the key from the fuel fill compartment.
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.
Servicing Your Honda
Fuel
125