2010 Mercedes GLK-Class Owner's Manual - Page 215

At the gas station Any noticeable irregularities in engine operation should be repaired promptly. Otherwise, excessive unburned fuel may reach the catalytic converter, causing it to overheat and potentially start a fire. starter switch. The driver's door then can be closed again. X Opening: Press fuel filler flap : at the point indicated by the arrow. X Turn fuel filler cap ; counterclockwise. X Take off fuel filler cap ;. X 213 i Only use premium unleaded gasoline with a minimum Posted Octane Rating of 91 (average of 96 RON/86 MON). Information on gasoline quality can normally be found on the fuel pump. Please contact gas station personnel in case labels on the pump cannot be found. Locking/unlocking the vehicle with the SmartKey or KEYLESS-GO automatically locks/unlocks the fuel filler flap. i In case the central locking system does not release the fuel filler flap, see "Fuel filler flap" (Y page 301). The fuel filler flap is located on the right-hand side of the vehicle towards the rear. X Closing: Turn fuel filler cap ; clockwise until it audibly engages. i Close the fuel filler flap before locking the vehicle. Otherwise the flap locking pin will prevent closing the fuel filler flap. X Close fuel filler flap :. Check regularly and before a long trip For information on quantities and requirements of operating agents, see "Fuels, coolants, lubricants, etc." (Y page 334). Check the following: REngine RTire oil level (Y page 215) level (Y page 216) lighting (Y page 303) inflation pressure (Y page 221) RCoolant RVehicle X Turn off the engine. RWasher RBrake i Leaving the engine running and the fuel filler cap open can cause the yellow engine malfunction indicator lamp ; to illuminate. For more information, see also "Practical hints" (Y page 295). X system and headlamp cleaning system (Y page 217) fluid (Y page 217) Remove the SmartKey from the starter switch. KEYLESS-GO: Open the driver's door. This puts the starter switch in position 0, same as with the SmartKey removed from the Z Operation Place fuel filler cap ; in direction of arrow into holder =. X Fully insert filler nozzle unit and refuel. X Only fill your tank until the filler nozzle unit cuts out - do not top off or overfill.