LML CP3 Conversion Kit | CP4 to CP3 Injection Pump Upgrade
Kit Add-ons
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Product Details
2011–2016 Duramax LML CP3 Conversion Kit — Replace the Factory CP4 Before It Fails
The factory CP4 injection pump on the 2011–2016 Chevy Silverado and GMC Sierra 2500/3500 6.6L LML Duramax is one of the most expensive weak points on these trucks. When a CP4 fails, it can send metal contamination through the high-pressure fuel system, potentially damaging injectors, rails, fuel lines, and other major components.
This CP3 Injection Pump Conversion Kit is designed to replace the unreliable factory CP4 setup with a proven CP3-style fuel system conversion. Whether you are building a stronger tow rig, upgrading for long-term reliability, or preventing a costly CP4 failure, this kit gives your LML Duramax the foundation it should have had from the start.
Important: This option is for the CP3 Injection Pump Conversion Kit. The CP3 pump itself is not included unless selected separately as an add-on or kit option.
Why Upgrade Your LML Duramax From CP4 to CP3?
The CP3 platform has a long-standing reputation in the diesel world for durability, consistent fuel delivery, and better reliability under demanding conditions. For LML Duramax owners, converting from CP4 to CP3 is one of the most common preventative upgrades because it addresses the weak point before it becomes a catastrophic repair bill.
This kit is built for owners who want peace of mind, stronger fuel system reliability, and a cleaner path to supporting future performance upgrades.
Key Features
- Fits 2011–2016 Chevy / GMC 6.6L LML Duramax
- Converts factory CP4 injection pump setup to CP3-style configuration
- Helps reduce the risk of costly CP4-related fuel system failure
- Supports improved fuel system reliability and consistency
- Includes required conversion hardware, lines, fittings, brackets, and installation components
- Ideal for towing, daily driving, work trucks, and performance-oriented LML builds
- Designed for a clean, reliable CP3 conversion without piecing together random parts
Kit Includes
This CP3 conversion kit includes the required supporting components needed to install a CP3 pump in place of the factory CP4 system, including:
- Fuel lines
- Required fittings
- Mounting brackets
- Hardware
- CP3 conversion-specific installation components
CP3 pump is not included unless selected separately.
Fitment
Make: Chevrolet / GMC
Model: Silverado 2500HD / 3500HD, Sierra 2500HD / 3500HD
Engine: 6.6L Duramax LML
Years: 2011, 2012, 2013, 2014, 2015, 2016
Best For
- LML owners wanting to prevent CP4 failure
- Tow rigs and work trucks needing better long-term reliability
- Duramax owners upgrading the fuel system before adding power
- Trucks already undergoing fuel system, turbo, or engine valley work
- Customers who want a proven CP3-style fuel system instead of relying on the factory CP4
Sasquatch Diesels Note
If you own a 2011–2016 LML Duramax, the factory CP4 pump is not something to ignore. A CP4 failure can turn into a full fuel system replacement, which is exactly why many LML owners choose to upgrade before it fails.
This CP3 conversion kit gives your Duramax a stronger, more reliable fuel system foundation and helps protect your truck from one of the most common high-dollar failures on the LML platform.
Shipping and Returns Policy
Important Notice: Please Read Carefully
Shipping Costs
Our shipping rates apply to orders shipped within the United States and Canada.
Shipping Times
- Air Shipping: Orders placed with air shipping by 2:00 PM EST on a business day will ship the same day.
- Ground Shipping: Our goal is to process and ship within 24-48 hours during business days, unless your order contains custom tunes that are preloaded which may take an additional 1-3 business days to ship.
Shipping Delays
Please be aware that we are not responsible for shipping delays due to weather conditions, natural disasters, or any other events beyond our control. No refunds will be issued for delays caused by such events.
Special Shipping Information
- Alaska and Hawaii:
Orders shipping to Alaska and Hawaii must select 2nd Day Air. Overnight shipping may not be available for remote areas, and these locations may experience longer delivery times than stated. - Remote Areas:
Some remote areas in Canada and other regions may incur additional shipping costs. If additional fees apply, we will notify you, and your order will be shipped once the extra shipping cost is paid. - International Shipping:
For shipping outside the US and Canada, please contact us through our contact page for assistance. - Large Packages:
All Full Exhausts, Pipes, and Air Intakes ship GROUND!
Returns Policy
- General Return Policy:
Due to the specialized nature of our products, we generally do not accept returns. Most items are VIN-specific or custom-built to order. - Defective Items:
We only accept exchanges for defective items. We recommend professional installation for these items. If a product is defective and cannot be exchanged or repaired, a refund of the original purchase price will be issued upon receipt of proof of malfunction or damage. - Return Exceptions:
In certain cases, we may make exceptions for returns. If your return request is approved, a 30% restocking fee will be applied. All items must be returned in their original packaging, and return shipping costs will not be refunded. - Cancellations:
All sales are final. If you cancel your order after it has been placed but before it has shipped, a 5% processing fee will apply. - Non-Returnable Items:
Certain items, such as hard parts (e.g., EGR kits, DPF pipes/exhaust, pyro kits, throttle valve kits, exhaust tips, and intakes), are not eligible for return unless an exception is made. If an exception is granted, a 30% restocking fee will be applied, along with the cost of return shipping.
Contact Us
Before returning any items, please contact us for specific shipping instructions.
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