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Checking and refilling levels
When the engine is running
A
lthough the alt
ern
ator generates electrical
power, the battery can still become dis-
charged while the vehicle is being driven.
This can occur when a lot of power is being
consumed but only a small amount supplied,
especially if the battery is not fully charged
initially.
To restore the necessary energy balance, the
system will then temporarily shut off the elec-
trical devices that are using a lot of power, or
reduce the current they are consuming. Heat-
ing systems in particular use a large amount
of electrical power. If you notice, for instance,
that the seat heating* or the rear window
heater is not working, they may have been
temporarily switched off or regulated to a
lower heat output. These systems will be
available again as soon as sufficient electri-
cal power is available.
You may also notice that the engine runs at a
slightly faster idling speed when necessary.
This is quite normal, and no cause for con-
cern. The increased idling speed allows the
alternator to meet the greater power require-
ment and charge the battery at the same
time.
Checking and refilling levels
Fi
l
lin
g the tank
Filling up
Read the additional information carefully
›››
page 51
If the automatic filler nozzle is operated cor-
rectly, it will switch itself off as soon as the
fuel tank is “full”. Do not try to put in more
fuel after the nozzle cuts out, as this will fill
the expansion chamber in the fuel tank.
The correct fuel grade for your vehicle is giv-
en on a sticker on the inside of the fuel tank
flap. Further notes on fuel can be found at
›››
page 243.
The capacity of your vehicle's fuel tank is giv-
en in
›››
page 51.
Vehicles with natural gas engines and hy-
brids
Every 6 months it is necessary to run on pet-
rol until the control lamp switches off and
then the tank must be refilled. This is neces-
sary to ensure that the system works proper-
ly, as well as the fuel quality required for driv-
ing with petrol.
WARNING
Fuel is highly flammable and can cause seri-
ous b
urns and other injuries.
●
Do not smoke when filling the fuel tank or a
canister. Naked flames are forbidden in the
vicinity due to the risk of explosion.
●
Observe legislation governing the use,
storage and carrying of a spare fuel canister
in the vehicle.
●
For safety reasons we do not recommend
carrying a spare fuel canister in the vehicle.
In an accident the canister could be damaged
and could leak.
●
If, in exceptional circumstances, you have
to carry a spare fuel canister, please observe
the following points:
–
Never fill fuel into the spare fuel canister
if it is inside or on top of the vehicle. An
electrostatic charge could build up during
filling, causing the fuel vapour to ignite.
Danger of explosion. Always place the
canister on the ground to fill it.
–
Insert the filling nozzle as far as possible
into the spare fuel canister.
–
If the spare fuel canister is made of met-
al, the filling nozzle must be in contact
with the canister during filling. This
helps prevent an electrostatic charge
building up.
–
Never spill fuel in the vehicle or in the
luggage compartment. Fuel vapour is ex-
plosive. Risk of fatal accident!
»
241
Technical dataAdviceOperationEmergenciesSafety
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