Mercedes-Benz GLS Owner's Manual page 221

218 Driving and parking
Even small amounts of the wrong fuel
could result in damage to the fuel system
and the engine. The repair costs are high.
Consult a qualified specialist workshop.
#
Have the fuel tank and fuel lines
#
drained completely.
* NOTE Damage to the fuel system caused
by overfilled fuel tanks
Only fill the fuel tank until the pump
#
nozzle switches off.
If you have added too much fuel because of a
defective filling pump, for instance:
Do not switch the ignition on.
#
Consult a qualified specialist workshop.
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* NOTE Fuel may spray out when you
remove the fuel pump nozzle
Only fill the fuel tank until the pump
#
nozzle switches off.
Requirements:
The vehicle is unlocked.
R
% Do not get into the vehicle again during the
refuelling process. Otherwise, electrostatic
charge could build up again.
Observe the notes on operating fluids and fuel.
The recommended octane number for your vehi‐
cle can be found on the information label in the
fuel filler flap.
1 Fuel filler flap
2 Bracket for fuel filler cap
3 Fuel type
4 QR code for rescue card
5 Tyre pressure table
Press on the back area of fuel filler flap 1.
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Turn the fuel filler cap anti-clockwise and
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remove it.