Schley 16100 GM Duramax LB7 Injector Cup PullerSchley 16100 GM Duramax LB7 Injector Cup Puller Removes the 2000 2004 LB7 Injector Cup without damage General Motors offered the LB7 Duramax diesel engine as an option for the Chevrolet Kodiak GMC Topkick and the Chevy Silverado GMC Sierra HD between the years of 2001 and 2004. Many of these trucks are still on the road and require routine service and repairs. One of the common repairs is re sealing the injector cup sleeves, which begin to leak over