Alfa Romeo 2016 4C Owner's Manual page 234

232 STARTING AND OPERATING
Fuel Filler Door Location
2. There is no fuel filler cap. A flap door inside the pipe
seals the system.
Fuel Nozzle Location
3. Insert the fuel nozzle into the filler pipe (the nozzle
opens and holds the flap door while refueling) and
start refueling – when the fuel nozzle "clicks" or shuts
off, the fuel tank is full.