2013 Ford Mustang Owner Manual Printing 3 - Page 157

156 Fuel and Refueling octane levels below 87 are not recommended. Premium fuel will provide improved performance and is recommended for severe duty usage, such as trailer tow. • For Shelby GT500 octane requirements, see the Shelby GT500 Supplement. • For Boss® 302 octane requirements. see the Boss® 302 Supplement. Do not be concerned if your engine sometimes knocks lightly. However, if it knocks heavily while you are using fuel with the recommended octane rating, see your authorized dealer to prevent any engine damage. RUNNING OUT OF FUEL Avoid running out of fuel because this situation may have an adverse effect on powertrain components. If you have run out of fuel: • You may need to cycle the ignition from off to on several times after refueling to allow the fuel system to pump the fuel from the tank to the engine. On restarting, crank time will take a few seconds longer than normal. With keyless ignition, just start the engine. Crank time will be longer than usual. • Normally, adding 1 gallon (3.8L) of fuel is enough to restart the engine. If the vehicle is out of fuel and on a steep grade, more than 1 gallon (3.8L) may be required. • The service engine soon indicator may come on. For more information on the service engine soon indicator, see to Warning Lamps and Indicators in the Instrument Cluster chapter. Refilling with a Portable Fuel Container WARNING: Do not insert the nozzle of portable fuel containers or aftermarket funnels into the capless fuel system. This could damage the fuel system and its seal, and may cause fuel to run onto the ground instead of filling the tank, which could result in serious personal injury. WARNING: Do not try to pry open or push open the capless fuel system with foreign objects. This could damage the fuel system and its seal and cause injury to you or others. 2013 05+ Mustang (197) Owners Guide gf, 3rd Printing USA (fus)