Bella 550 BR Owner's Manual page 153

28. Fuel system functioning
Fuel filling hole
Fuel tank ventilation valve
Fuel tank ventilation valve connector
Fuel tank filling hose connector
Fuel return hose
(only for diesel engines)
Engine
The location of equipment may vary depending on the model or the equipment.
31
Fuel tank
Fuel level sensor
Fuel filling hose
Fuel filter
(assembled to the fuel filling hose)