I am a Mack / Volvo Diesel Instructor at Wyotech in Blairsville, PA. I worked in Fuel Injection for 27 years before I came here to teach. I have worked on many Mack ( American and Robert Bosch ) fuel pumps in the past 27 years. I also worked at O'Briens Commercial Truck Spring for a few years doing spring repair before I went to Diesel school. I have done the famous Camel Back Springs.