Fleece Performance Engineering
Fleece CP3 Conversion Kit with CP3 for 2011-2016 LML Duramax
Fleece CP3 Conversion Kit with CP3 for 2011-2016 LML Duramax
SKU: FPE-LML-CP3-WP
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Convert Your LML Fuel System from CP4 to CP3
Improve the reliability and fuel system performance of your 2011-2016 LML Duramax with the Fleece CP3 Conversion Kit. The factory CP4 injection pump has become known for costly failures that can contaminate the entire fuel system and lead to expensive repairs.
Converting to a Bosch CP3 pump provides a proven solution trusted by Duramax owners looking for improved dependability and fuel delivery.
This complete LML Duramax CP3 Conversion Kit is designed for a straightforward installation with OEM-style fit and finish. The kit includes a brand-new Bosch CP3 high-pressure injection pump, Fleece-exclusive moulded fuel feed and return hoses, high-flow fuel fittings, and a valley feed line that supports aftermarket lift pump applications.
No custom tuning is required, making this kit an excellent upgrade for daily-driven, towing, and performance-oriented Duramax trucks.
Features:
- Brand-new Bosch CP3 high-pressure injection pump
- High-flow CP3 feed and return fuel fittings
- Preformed fuel feed and return lines for proper fitment
- OEM-style installation and appearance
- Supports aftermarket lift pump applications
- No tuning required
- 50-State Compliant – EO# D-834-1
Kit Contents:
- Bosch CP3 High-Pressure Injection Pump
- CP3-to-Rail High-Pressure Fuel Line
- High-Flow CP3 Feed and Return Fittings
- Preformed Feed and Return Fuel Lines
- CP3 Mounting Adapter
- Dosing Injector Feed Line
- FCA Extension Harness
- Fuel Temperature Sensor Mounting Bracket
- Low-Pressure Fuel Feed Lines
- Hardware Kit
Additional Information:
- Patent Pending
- Dorman 904-484 or CTA 3477 Fuel Line Quick Disconnect Tool is recommended for installation
- Designed specifically for 2011-2016 GM Silverado and Sierra HD trucks equipped with the 6.6L LML Duramax engine
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Frequently Asked Questions
A CP4 to CP3 conversion replaces the factory CP4 injection pump with a Bosch CP3 pump. Many Duramax owners choose this upgrade to improve reliability and reduce the risk of fuel system damage associated with CP4 pump failures.
No. This Fleece CP3 Conversion Kit is designed to operate without custom tuning when installed on a stock or mildly modified 2011-2016 LML Duramax.
The Bosch CP3 is known for its durability, consistent fuel delivery, and ability to support higher fuel demands compared to the factory CP4 pump.
Yes. The kit includes a valley feed line designed to support many aftermarket lift pump applications.
This kit is designed specifically for GM Silverado HD and Sierra HD trucks equipped with the 6.6L LML Duramax engine from 2011 through 2016.
Many owners choose a Duramax CP3 Conversion Kit because CP3 pumps have a strong reputation for reliability compared to the factory CP4 system, helping reduce the likelihood of catastrophic pump failure.
The kit includes a new Bosch CP3 pump, fuel lines, fuel fittings, mounting adapter, wiring harness extension, temperature sensor bracket, and all required installation hardware.