It’s been more than a decade since high-pressure common-rail technology revolutionized the diesel industry. With its first application appearing on the ’01 LB7 Duramax engine, it should come as no surprise that the heart of these systems—the high-pressure pump—hits a point where it’s time for either a rebuild or replacement. The Bosch CP3, used on the ’01-to-’10 Duramax and ’03-to-current Cummins engines, is known to last 250,000 miles or more before needing to be replaced. Of course, performance enthusiasts also know these pumps are only capable of supporting approximately 500 hp.