2011-2016 GM/CHEVROLET 6.6L DURAMAX CP4 TO CP3 FUEL PUMP CONVERSION KIT - AFTERMARKET
Upgrade the reliability and performance of your 2011–2016 6.6L Duramax LML by replacing the factory Bosch CP4 fuel pump with a proven Bosch CP3. The CP4 pump is known for premature failures that can cause catastrophic engine damage, while the CP3 has a long history of durability and consistent fuel delivery. This conversion kit includes everything you need for a direct swap, giving you peace of mind whether you’re towing, hauling, or daily driving.
What comes in the Kit:
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High Pressure Fuel Rail Line
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Fuel Rail Plug and Nut
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CP3 Block Adapter with O-ring
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(3) CP3 Block Adapter Bolts (Flange Head, M8x1.25x35mm)
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CP3 Pump Fittings – 3/8”
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CP3 Pump Fittings – 1/2"
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(2) Sealing Washers
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Low Pressure Fuel Feed Line
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3/8”x8” Flexible Fuel Line with Hose Clamps (CP3 Return)
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1/2”x30” Flexible Fuel Line with Hose Clamps (Filter to CP3)
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3/4” P-Clamp
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Fuel Return Line Block Off with O-ring
Features and Benefits:
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Replaces failure‑prone CP4 with reliable CP3 fuel pump
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Prevents costly engine and fuel system damage caused by CP4 failure
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Provides consistent high‑pressure fuel delivery
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Compatible with stock or performance Duramax applications
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Bolt‑on installation with included hardware and adapter harness
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CNC‑machined components for precision fitment
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Long‑lasting aftermarket solution trusted by diesel owners
Vehicle Compatibility:
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2011 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
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2012 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
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2013 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
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2014 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
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2015 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
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2016 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
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2011–2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML
Designed specifically for LML Duramax models originally equipped with a CP4 pump.
This conversion is one of the best preventative upgrades you can make to protect your LML Duramax. By installing a CP3 pump, you’ll ensure greater fuel system reliability, improved injector life, and peace of mind on the road.
Shipping Disclaimer:
✔️ We ship via USPS, UPS, and FedEx.
✔️ Carrier selection is based on package size, weight, and destination.
✔️ Expedited shipping options are available at checkout.
✔️ Orders are processed within 1 business day (Monday–Friday).
✔️ Orders placed on weekends or holidays will be processed on the next business day.
✔️ Tracking information will be provided once the item ships.
✔️ Shipping to PO Boxes, APO/FPO may be limited based on carrier restrictions.
California Proposition 65 Warning:
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information, go to www.P65Warnings.ca.gov
