2015 Ford F450 Super Duty Crew Cab Diesel Supplement Printing 1 - Page 24

Fuel and Refueling Installation - Engine-mounted fuel filter 1. Install the new filter into the filter bracket. Turn the filter clockwise to lock it in place. 2. Reconnect both fuel lines. Note: Using a fuel that has more than average impurities may require you to replace the fuel filter more frequently than the service interval specifies. Note: You will need to purge the system of air after removal or changing of the filter. See purging air from the fuel system later in this chapter. Purging air from the fuel system Turn the ignition key to on for 30 seconds, then turn it to off. Do this six times in a row to purge any trapped air from the fuel system. After filter service, a no start or rough running engine may indicate that air is entering the system through the filter bowl seal or drain. Make sure the drain is tight and you tightened the filter bowl to the mechanical stop. Importance of maintaining the Diesel Exhaust Fluid (DEF) level In order for the selective catalytic reduction system to operate properly, the DEF level must be maintained. Generally, the DEF tank should be filled during the oil change service interval. See General Maintenance Information (page 59). However, certain conditions or driving styles, such as trailer towing or fast rates of acceleration, will require the refilling of the DEF tank more often. The engine control unit will monitor the amount of fluid available in the DEF tank. Running a system check in the information display will indicate whether the DEF level is ok or if it is less than 1/2 full. A message will display in the information display when the DEF level is low and needs to be refilled. When you see this message, you should refill your tank. See the Information displays chapter of your Owner's Manual for information display functions. For instructions on refilling your DEF tank, see filling the Diesel Exhaust Fluid (DEF) tank in this supplement. SELECTIVE CATALYTIC REDUCTION SYSTEM Your vehicle is equipped with a selective catalytic reduction system to help reduce emission levels of oxides of nitrogen from the exhaust of the diesel engine. The system automatically injects Diesel Exhaust Fluid (DEF) into the exhaust system to enable proper selective catalytic reduction function. Diesel Exhaust Fluid (DEF) warning messages and vehicle operations WARNINGS Diesel Exhaust Fluid (DEF) must be refilled when low or replaced when contaminated or your vehicle speed will be speed limited to 50 mph (80 km/h). In these conditions, drive with caution and refill DEF immediately. If the DEF becomes empty or contaminated and fluid is not replaced, your vehicle will become limited to idle speed only once stopped. In these conditions, be cautious where you stop your vehicle because you may not be able to drive long distances and will not be able to maintain highway speeds until you refill or replace the DEF. 21 Super Duty (TFA) , enUSA