Master Tech Diesel reman Cp3 injection pump for GM LB7 Duramax 2001-2004. Master Tech Diesel injection pumps have a 2 Year Warranty. Bosch reman injection pumps are rebuilt with the highest quality parts and tested with the best calibration equipment available on the market. $225.00 refundable core charge due. We email you a separate paypal invoice for the core charge that will be refunded upon the return of the old used core.