WEHRLI CUSTOM FAB WCF100402 LML DURAMAX HIGH PRESSURE LINE CP3 CONVERSION KIT

Product Description

The WEHRLI CUSTOM FAB WCF100402 LML DURAMAX HIGH PRESSURE LINE CP3 CONVERSION KIT is designed specifically for diesel performance enthusiasts performing a CP3 conversion on 2011-2016 LML Duramax engines. This precision-engineered kit provides the correct high-pressure fuel lines required to connect a CP3 injection pump to the factory LML fuel system, ensuring reliable fuel delivery for high-performance builds.

Wehrli Custom Fabrication developed this kit to simplify one of the most important aspects of a Duramax CP3 swap — proper high-pressure fuel routing. The lines are engineered for durability and correct fitment, allowing a clean installation when upgrading from the factory CP4 injection pump to the far more reliable CP3 system. This upgrade is extremely popular among LML owners looking to improve reliability, fuel system durability, and horsepower capability.

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Key Features

• Designed specifically for LML Duramax CP3 conversions
• Correct high-pressure fuel lines for CP3 pump installation
• Precision-formed lines for proper routing and fitment
• Supports high horsepower Duramax fuel system upgrades
• Manufactured by Wehrli Custom Fabrication
• Designed for reliability and long-term durability

Fitment

• 2011 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2012 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2013 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2014 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2015 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2016 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2011-2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML

Installation Note: This kit is intended for use with a CP3 conversion system. Additional components such as the CP3 pump, mounting bracket, and tuning are required for a full conversion.

Frequently Asked Questions

Why do LML Duramax owners perform a CP3 conversion?

The factory CP4 injection pump used on LML Duramax engines has known reliability issues. Converting to a CP3 pump significantly improves durability and fuel system reliability.

Does this kit include the CP3 pump?

No. This kit includes only the high-pressure fuel lines required for the conversion. The CP3 pump and mounting hardware must be purchased separately.

Is tuning required after installing a CP3 conversion?

Yes. Proper ECM tuning is typically required to ensure correct fuel system operation and optimal engine performance.

Is this compatible with stock injectors?

Yes. The conversion lines are compatible with factory LML injectors when used with the appropriate CP3 conversion kit.

Is this kit intended for high horsepower builds?

Yes. CP3 conversions are commonly used in both reliability upgrades and high horsepower Duramax performance builds.

Specifications for WEHRLI CUSTOM FAB WCF100402