Mercedes-Benz R 350 Operator's Manual page 166

Problems with fuel and the fuel tank
Problem
Fuel is leaking from the
vehicle.
The engine does not
start.
The fuel filler flap
cannot be opened.
Possible causes/consequences and M Solutions
G
Risk of explosion or fire
The fuel line or the fuel tank is faulty.
Turn the SmartKey to position 0 in the ignition lock immediately
X
and remove it ( page 149).
Y
Do not restart the engine under any circumstances.
X
Consult a qualified specialist workshop.
X
The fuel tank of a vehicle with a diesel engine has been run
completely dry.
Refuel the vehicle with at least 5.3 US qt (5 liters) of diesel.
X
Turn the ignition on for approximately ten seconds
X
( page 149).
Y
Start the engine continuously for up to ten seconds until it runs
X
smoothly.
If the engine does not start:
Turn the ignition on again for approximately ten seconds
X
( page 149).
Y
Start the engine again continuously for up to ten seconds until
X
it runs smoothly.
If the engine does not start after three attempts:
Consult a qualified specialist workshop.
X
The fuel filler flap is not unlocked.
or
The SmartKey battery is discharged.
Unlock the vehicle using the mechanical key (
X
Open the tailgate.
X
Manually unlock the fuel filler flap using the emergency release
X
( page 162).
Y
The fuel filler flap is unlocked, but the opening mechanism is
jammed.
Consult a qualified specialist workshop.
X
Refueling
163
page 78).
Y
Z