Problems with the fuel and fuel tank
If your vehicle is losing fuel, the fuel lines or the
fuel tank are defective.
X
Turn the key immediately to position 0 in the
ignition lock and remove it.
X
Do not restart the engine under any circum-
stances.
X
Consult a qualified specialist workshop.
If the fuel tank has been run dry, after refueling
carry out the following steps:
X
Before starting the engine: switch on the igni-
tion three or four times.
X
Turn the key to position 2 in the ignition lock
(
Y page 119).
The % preglow indicator lamp in the instru-
ment cluster lights up briefly.
X
Once the % preglow indicator lamp goes
out, turn the key to position 3 in the ignition
lock and release it as soon as the engine is
running.
You can start the diesel engine without preglow
when the engine is warm.
Diesel Exhaust Fluid (DEF)
Important safety notes
!
Only use DEF in accordance with
ISO 22241. Never mix DEF with additives or
thin it with tap water. The exhaust gas after-
treatment may otherwise be damaged.
Observe the MB Specifications for Service
Products, Sheet 352.0.
Damage that results from the use of additives
or tap water leads to the loss of the New
Vehicle Limited Warranty.
!
If DEF comes into contact with a painted or
aluminum surface, wash the surface off
immediately with plenty of water.
!
DEF is not a diesel additive and must not be
mixed with fuel in the tank. Even small
amounts of DEF can cause engine damage.
Damage that results from the blending of DEF
will not be covered by the New Vehicle Limi-
ted Warranty.
i
If the outside temperature is below 12 ‡
(Ò11 †) it may be difficult to top up. If the DEF
is frozen and there is an active warning indi-
cator, topping up may not be possible. Park
the vehicle in a warm place, e.g. in a garage,
until the DEF has become liquid again. Top-
ping up is then possible again. Alternatively,
have the DEF tank refilled at a qualified spe-
cialist workshop.
i
If you add DEF at temperatures below 12 ‡
(Ò11 †) it is possible that the level is not
shown correctly due to the frozen DEF.
Drive for at least 20 minutes(heating phase in
the tank activated) and then st
op the vehicle
for at least 30 seconds. The level is then
shown correctly.
You will find further information on DEF in the
"Service products" section (
Y page 277).
Refueling procedure
DEF filler neck
Non-lockable DEF filler cap
Example: DEF filler cap in the engine compartment
X
To open: switch off the ignition.
X
Open the hood (Y page 218).
X
Turn filler cap : counter-clockwise and
remove it.
X
To close: replace cap : on the filler neck and
turn it clockwise.
You will hear a click when cap : is fully
closed.
X
Close the hood (Y page 219).
Refueling
129
Driving and parking
Z
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