Replacing the CP3 injection pump on a 2004.5 - 2005 LLY Duramax means removing the intake tube and Y-bridge, the thermostat housing crossover and the coolant bypass pipes, and disconnecting the pump's fuel hoses. Every gasket and seal you disturb along the way should be replaced. The Merchant Automotive CP3 Fuel Injection Pump Install Gasket Kit puts them all in one box, including the pump-to-adapter seals and new Merchant Automotive molded inlet and return hoses.

You won't be waiting on a missing seal with the engine half apart, and everything goes back together leak-free.

Key Features

• Complete gasket and seal kit for a CP3 removal and install on the LLY
• Includes the intake tube, Y-bridge, thermostat crossover and coolant bypass seals
• Includes the CP3 bracket-to-block seal and the pump-to-adapter O-ring
• New Merchant Automotive molded injection pump inlet and return hoses
• Built from GM part number gaskets and seals

Benefits

• Every gasket, seal and hose for the job in one box Prevents fuel, coolant and boost leaks after the pump job No delays from missing parts once the engine is torn down
• Prevents fuel, coolant and boost leaks after the pump job
• No delays from missing parts once the engine is torn down

Fitment

• 2004.5 - 2005 Chevrolet Silverado 2500HD / 3500HD 6.6 Liter Duramax LLY
• 2004.5 - 2005 GMC Sierra 2500HD / 3500HD 6.6 Liter Duramax LLY

For other years, see our 2001 - 2004 LB7 Install Kit, 2006 - 2007 LBZ Install Kit and 2007.5 - 2010 LMM Install Kit. Treat the new pump with Merchant Automotive Diesel Fuel Additive.

What's Included

• (1) Merchant Automotive Injection Pump Inlet Hose (replaces 12625277)
• (1) Merchant Automotive Injection Pump Return Hose, LLY
• (1) CP3 Fuel Injection Pump Bracket Seal, Adapter to Block (12638504)
• (1) CP3 Fuel Pump to Adapter Small O-ring (97351488)
• (1) Intake Tube Gasket (97306568)
• (1) Intake Tube Seal Kit (10016)
• (2) Intake Y-Bridge Gaskets (97251963)
• (2) Thermostat Housing Crossover at Head Gaskets (97223686)
• (1) Water Pump Bypass Upper Pipe Seal (94011602)
• (1) Water Pump Bypass Lower Pipe Seal (94011603)
• (1) Heater Pipe Seal (94011605)

Details:

• Engine Manufacturer: Duramax
• Liter: 6.6 Liter
• Engine Designation: LLY
• Engine Years: 2004-2005

Applications:

• 2004-2005 Silverado/Sierra 2500HD/3500HD LLY