2015 Ford F450 Super Duty Crew Cab Owner Manual Printing 2 - Page 143

Fuel and Refueling We recommend regular unleaded gasoline with a pump (R+M)/2 octane rating of 87. Some stations offer fuels posted as regular with an octane rating below 87, particularly in high altitude areas. We do not recommend fuels with an octane rating below 87. Do not be concerned if your engine sometimes knocks lightly. However, if it knocks heavily under most driving conditions while you are using fuel with the recommended octane rating, see your authorized dealer to prevent any engine damage. Refilling With a Portable Fuel Container WARNINGS The fuel system may be under pressure. If you hear a hissing sound near the fuel filler door, do not refuel until the sound stops. Otherwise, fuel may spray out, which could cause serious personal injury. Do not try to pry open or push open the fuel system with foreign objects. This could damage the fuel system and its seal and cause personal injury to you or others. Use the following directions when filling from a portable fuel container: 1. Remove the fuel cap from the fuel filler pipe by rotating it counter clockwise. 2. Slowly insert the portable fuel container into the fuel filler opening. 3. Fill the vehicle with fuel from the portable fuel container. 4. When done, remove the portable fuel container nozzle and reinstall the fuel cap. Insert fuel cap into fuel filler opening and turn clockwise until you hear a click. RUNNING OUT OF FUEL Avoid running out of fuel because this situation may have an adverse effect on powertrain components. If you run out of fuel: • You may need to switch 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. When restarting, cranking time takes a few seconds longer than normal. With keyless ignition, just start the engine. Crank time will be longer than usual. • Normally, adding 1 gallon (3.8 liters) of fuel is enough to restart the engine. If the vehicle is out of fuel and on a steep grade, more than 1 gallon (3.8 liters) may be required. • The service engine soon indicator may come on. For more information on the service engine soon indicator, See Warning Lamps and Indicators (page 79). REFUELING WARNINGS Fuel vapor burns violently and a fuel fire can cause severe injuries. Read and follow all the instructions on the pump island. Turn off your engine when you are refueling. Do not smoke if you are near fuel or refueling your vehicle. 140 Super Duty (), enUSA