Mercedes-Benz SLK Operator's Manual page 156

Refueling
154
Completely insert the filler neck of the fuel
X
pump nozzle into the tank and refuel.
Only fill the tank until the pump nozzle
X
switches off.
i
Do not add any more fuel after the pump
stops filling for the first time. Otherwise,
fuel could leak out.
Closing
Place fuel filler cap on the fuel filler neck
X
and turn clockwise until it engages.
Close fuel filler flap :.
X
i
Close the fuel filler flap before locking the
vehicle.
i
The 8 reserve fuel light flashes if you
are driving with the fuel filler cap open. A
message appears in the multifunction
display ( page 228).
Y
In addition, the ;(
Engine warning lamp may light up.
page 250) Check
Y