BMW 2013 5 Series - Manual (Page 183)

Pull the green knob with the fuel pump symbol.
This releases the fuel filler flap.
Observe the following when
refueling
The fuel tank is full when the filler nozzle clicks
off the first time.
Do not overfill the fuel tank
Do not overfill the fuel tank; otherwise fuel
may escape, causing harm to the environment
and damaging the vehicle.◀
Handling fuels
Obey safety regulations posted at the gas
station.◀
Seite 183
Refueling Mobility
183
Online Edition for Part no. 01 40 2 903 008 - 07 12 490