2003 Ford Excursion 7.3L Diesel Supplement 3rd Printing - Page 6

Diesel information The air filter element should be replaced when the colored band on the gauge reaches the CHANGE FILTER mark. Engine performance and fuel economy are adversely affected when maximum restriction is reached. After servicing the air filter element, reset the restriction gauge by pressing the button on the end of the gauge. AIR FILTER GAUGE E FI CHANG LTER CHANGE FILTER Air filter restriction gauge, F-250/350/450/550 & Excursion The restriction gauge, located on the upper housing of the air cleaner assembly, monitors the condition of the air filter element in two ways: First, the colored indictor inside the gauge highlights the percentage that the air filter element is clogged with dust or contaminants. Refer to Engine Compartment in Service Points chapter. Second, the gauge contains an electrical switch which illuminates a warning light on the instrument cluster when the air filter element is 100% clogged. Refer to F-250/350/450/550, Excursion in Warning Lights chapter. Check the air filter restriction gauge whenever the hood is raised to perform general engine maintenance. If the vehicle is operated in extremely dusty conditions, check the gauge at least every 800 km (500 miles), or two weeks, whichever comes first. The air filter element must be replaced when the colored band on the gauge reaches the CHANGE FILTER mark. Engine performance and fuel economy are adversely affected when the maximum restriction is reached. 6