WEHRLI CUSTOM FAB WCF100260 2011-2016 LML DURAMAX CP3 CONVERSION KIT

Product Description

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The WEHRLI CUSTOM FAB WCF100260 2011-2016 LML DURAMAX CP3 CONVERSION KIT is one of the most trusted solutions for eliminating the factory CP4 injection pump found in 2011-2016 GM Duramax trucks. The OEM CP4.2 pump has become widely known as a weak point in the LML fuel system, where internal failure can send metal debris through the entire system and lead to extremely expensive repairs.

Wehrli Custom Fabrication developed this kit to provide a cleaner, more reliable solution by converting the LML fuel system to the proven Bosch CP3 injection pump platform. The CP3 design has been trusted in earlier Duramax platforms and is widely recognized for its durability and performance capability.

This kit includes precision CNC-machined components and pre-formed fuel lines designed for a factory-style installation with exceptional fit and finish. It is engineered to work with stock or lightly modified trucks and can be paired with an OEM LBZ-style CP3 pump (sold separately) for improved reliability and fuel system performance.

Key Features:

• Converts failure-prone LML CP4 fuel pump to the proven CP3 system
• CNC machined billet CP3 pump mounting plate
• Pre-formed feed and return fuel lines for OEM-like installation
• High-flow stainless steel CP3 feed and return fittings
• 9th injector fuel line and billet aluminum distribution block
• FCA / MPROP inlet metering valve extension harness
• Low pressure fuel feed lines included
• Complete installation hardware
• Designed for stock and lightly modified trucks
• Made in the USA

Fitment:

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

FAQ

Why convert the LML Duramax to a CP3 pump?

The factory CP4 pump is a known failure point in the LML Duramax fuel system. When the CP4 fails it can contaminate the entire fuel system with metal debris. Converting to a CP3 pump greatly improves reliability and helps prevent catastrophic fuel system failure.

Does this kit include the CP3 injection pump?

No. The WCF100260 kit provides the hardware required to install a CP3 pump. The CP3 pump itself must be purchased separately.

Is tuning required for this CP3 conversion?

Most stock style CP3 pumps can operate without tuning, but performance or stroker pumps may require ECM tuning to properly control fuel delivery.

Is this kit difficult to install?

The kit is engineered with pre-formed lines and OEM-style routing to simplify installation, but fuel system work should be performed by experienced technicians familiar with diesel injection systems.

Is this product emissions legal in California?

This product is typically listed as not legal for sale in California and may not ship to that state due to emissions regulations.