An LML CP3 conversion kit bundle is a complete fuel system upgrade designed for 2011–2016 6.6L Duramax diesel trucks. It replaces the factory CP4 high-pressure fuel pump with a more reliable CP3 injection pump setup. Many Silverado and Sierra HD owners choose this upgrade to improve fuel system reliability, increase fueling capability, and reduce the risk of costly CP4 pump failure.

What Is an LML CP3 Conversion Kit Bundle?

An LML CP3 conversion kit bundle is a packaged system that includes all major components needed to swap the factory CP4 pump for a CP3 system.

A typical bundle may include:

• CP3 high-pressure injection pump
• Mounting adapter and brackets
• Fuel feed and return lines
• High-pressure fuel line to rail
• Wiring harness extensions
• Fuel fittings and adapters
• Hardware and seals kit

Some complete bundles come with a brand-new OEM CP3 pump already included, making installation more straightforward and reliable.

Why Upgrade from CP4 to CP3?

The factory CP4 pump used in LML Duramax engines is known for potential failure issues that can lead to expensive fuel system damage. When it fails, it can send metal debris through the fuel system, often requiring replacement of injectors, lines, and the pump itself.

A CP3 conversion bundle helps solve this by offering:

• More durable and proven pump design
• Better fuel delivery stability
• Reduced risk of catastrophic fuel system failure
• Improved support for performance tuning