FITMENT
- 2011-2016 6.6L Chevy GM Silverado Sierra Duramax LML 2500 3500 engine.
DESCRIPTION
Product Overview
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Protect your 11–16 6.6L LML Duramax from the infamous "ticking time bomb"—the factory CP4 injection pump. The OEM CP4 is notorious for sudden, catastrophic failures that send metal debris through the entire common rail system, leading to engine shutdown and over $10k in repair bills.
- The LML CP3 Conversion Kit offers a permanent, bulletproof solution. By replacing the fragile CP4 with the ultra-reliable, high-capacity CP3 architecture used in legendary older Duramax generations, you can completely safeguard truck.
Key Features
- High-Flow Performance Ready: Engineered from solid billet aluminum with high-flow fittings and a valley feed line that perfectly support heavy towing and aftermarket lift pumps.
- Eliminates $10k+ Repair Threats: Upgrades truck to the heavy-duty CP3 platform, permanently eliminating the catastrophic failure risks of the fragile factory CP4 pump.
- OEM-Quality Molded Hoses: Includes exclusive preformed fuel lines for a perfect, factory-like fit, ensuring a leak-free and much cleaner engine bay than generic loose hoses.
- Flexible "No Pump" Value: Contains all critical adapters, brackets, and premium hardware needed for the mechanical swap, letting you choose CP3 pump separately.
FAQ
Q: Why is the factory CP4 pump considered a "ticking time bomb"?
A: The CP4 pump depends on diesel fuel for lubrication. Over time, poor fuel lubricity or contamination can cause internal wear. If the pump fails, metal debris can spread through the fuel system, potentially damaging injectors, fuel rails, and other costly components.
Q: Do I need custom computer programming (Tuning) after installing this kit？
A: Yes, custom calibration tuning is required. Because the fuel volume control valve (FCA/MPROP) on a CP3 operates differently than a CP4, the truck’s ECM must be reflashed with a CP3 conversion tune to prevent error codes and ensure smooth fuel delivery.
Q: Will this CP3 kit affect my truck's diagnostic system?
A: Once properly tuned, it operates seamlessly with no warning lights. As long as the ECM is reflashed with a CP3 conversion tune, the truck’s factory diagnostics will read the new pump perfectly, ensuring full factory functionality with zero check engine lights.
Q: Why should I replace my factory CP4 with a CP3 pump?
A: The factory CP4 is highly sensitive to fuel quality and lubrication. When it fails, it grinds itself internally, sending thousands of razor-sharp metal shavings through your injectors, rails, and fuel lines. Upgrading to the legendary, heavy-duty CP3 pump completely eliminates this design vulnerability.
