Engineered specifically for 2006 through 2007 Chevrolet Silverado and GMC Sierra 2500HD/3500 trucks powered by the 6.6L Duramax V8 turbo diesel engine (LBZ code), the Alliant Power CP3 Pump Installation Kit (Part # AP0129) supplies every essential seal, gasket, and mounting O-ring required when servicing or replacing the high-pressure fuel injection pump.

During a CP3 pump replacement, reusing old, heat-cycled gaskets and brittle rubber O-rings can cause catastrophic oil leaks, coolant leaks, or air ingestion in the fuel supply system. As an authorized tier-1 aftermarket diesel supplier, Alliant Power bundles all factory-required hardware into one convenient kit to streamline professional workshop installations with zero core charge.

Key Features & Benefits

• Complete All-In-One Hardware Solution: Includes every necessary replacement gasket, seal, and O-ring required for a professional CP3 pump service.
• OEM-Quality Material Standards: Manufactured to strict OE tier-1 specifications to withstand extreme under-hood temperatures and high oil pressure.
• Includes EGR Valve Seals: Contains matching gaskets and seals required for proper reassembly of associated EGR components during pump access.
• Prevents Fluid Leaks: Eliminates the risk of oil, coolant, or fuel leaks commonly caused by reusing fatigued factory seals.
• Zero Core Charge: Brand-new outright service component requiring no core deposit or core return shipping.

Technical Specifications

• Manufacturer / Brand: Alliant Power
• Manufacturer Part Number / SKU: AP0129
• Product Type: High-Pressure Fuel Injection Pump (CP3) Installation Kit
• Included Contents: Pump Mounting Gaskets, Snout O-Rings, Fuel Line Seals, and EGR Valve Gaskets
• Truck Platform: 2006–2007 GM 2500HD / 3500 Silverado & Sierra (Classic Body)
• Engine Platform: 6.6L Duramax V8 Turbo Diesel (LBZ Code)
• Core Requirement: None
• Warranty: Alliant Power 2-Year Unlimited Mileage Warranty

Vehicle Fitment & Technical Installation Notes

• 2006–2007 Chevrolet Silverado 2500HD / 3500 (LBZ) – 6.6L Duramax Diesel
• 2006–2007 GMC Sierra 2500HD / 3500 (LBZ) – 6.6L Duramax Diesel
• Fits Model Years: 2006, 2007 (Classic body styles)
• Installation Tip: Disconnect the negative battery cables and drain coolant levels as required to clear the thermostat housing and associated brackets blocking access to the CP3 pump valley. Thoroughly clean all mounting surfaces before seating new Alliant Power gaskets and O-rings, applying a light film of clean engine oil to O-ring seals during reassembly to prevent pinching.