2011 Mercedes GLK-Class Owner's Manual - Page 142

140 Refueling ! To prevent ESP® from intervening, the ignition must be switched off (SmartKey in position 0 or 1) if: Rthe have the fuel tank and fuel lines drained completely. Driving and parking parking brake is being tested on a brake dynamometer. Rthe vehicle is being towed with only one axle raised (not permitted for vehicles with 4MATIC). The brake system could otherwise be damaged. Gasoline Fuel grade ! You should only refuel with unleaded premium-grade gasoline as this avoids damaging the catalytic converter. If engine running problems are apparent, have the cause checked immediately and repaired. Excess unburned fuel can otherwise enter the catalytic converter, leading to overheating and possibly causing a fire. i Only refuel with unleaded premium-grade gasoline with a specified minimum octane number of 91 (average value of 96 RON/ 86 MON). Usually you will find information about the fuel grade on the pump. If you cannot find the label on the gasoline pump, ask the gas station staff. You can find further information under "Fuel" (Y page 296), by consulting an authorized Mercedes-Benz Center or visiting http://www.mbusa.com (USA only). Refueling Fuel filler flap The fuel filler flap is unlocked or locked automatically when you open or close the vehicle with the SmartKey or using KEYLESSGO. The position of the fuel filler flap is to the rear on the right. The position of the fuel filler cap is displayed in the instrument cluster 8. The arrow next to the gas pump indicates the side of the vehicle. Refueling Important safety notes G Warning Gasoline is highly flammable and poisonous. It burns violently and can cause serious personal injury. Never allow sparks, flames or smoking materials near gasoline. Turn off the engine before refueling. Whenever you are around gasoline, avoid inhaling fumes and any skin or clothing contact. Direct skin contact with fuels and the inhalation of fuel vapors are damaging to your health. G Warning Overfilling of the fuel tank may create pressure in the system which could cause a gas discharge. This could cause the gasoline to spray back out when removing the fuel pump nozzle, which could cause personal injury. ! Do not use diesel to refuel vehicles with a gasoline engine. Even small amounts of the wrong fuel result in damage to the fuel system and engine. ! Do not switch on the ignition if you accidentally refuel with the wrong fuel. Otherwise, the fuel will enter the fuel lines. Notify a qualified specialist workshop and