Removal & Disassembly
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
While holding secondary oil pump shaft with a hex driver, remove oil pump driven gear nut. Remove oil pump driven gear. Do not damage crankshaft sensor reluctor teeth. Remove oil pump drive gear and crank sensor reluctor assembly. Remove oil pump bolts. Remove oil pump. Remove O-ring and discard.