Section 03-12: Air Intake System | 1996 F-150, F-250, F-350, F-Super Duty, Bronco Workshop Manual |
The 7.3L diesel air induction system uses an air restriction gauge to indicate when to replace the air filter element. The air filter element should be replaced when the yellow band in the restriction 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, the restriction gauge can be reset by pushing the button on the end of the gauge. The restriction gauge is located on the clean-air side of the air cleaner upper housing.