Description

2011-2016 GM 6.6L LML Duramax Diesel CP3 Pump Conversion Kit

High Pressure CP4 to CP3 Diesel Injection Pump Conversion Kit for 2011-2016 GM 6.6L LML Duramax Diesel equipped trucks.  S&S LML-CP3-CARB

S&S Diesel Motorsport® is a leader in common-rail diesel fuel injection systems and upgrades.  They have developed a solution for CP4.2 high-pressure pump failures in the LML Duramax engine.  The S&S solution is to replace the problem with a more dependable and proven CP3 high pressure fuel injection pump.

CP4 high pressure pumps are known to fail, commonly taking out the entire, very costly, high-pressure fuel injection system with it (injectors, rails, lines).  S&S Diesel Motorsport offers a CARB-compliant (EO #D-756-4) 50 State CP3 conversion available for the LML.  This includes all hardware necessary to replace the CP4 with a CP3.  This upgrade requires no tuning changes, and still maintains factory emissions control equipment.

Why do CP4 Pumps go bad and have such a bad reputation?

CP4 high-pressure diesel fuel injection pumps are used in many modern diesel engines including Chevrolet Duramax, Ford Power Stroke, and Ram Cummins.  The failure rate is not as bad as what you think and read about here on the internet, but it is real.  Failure is primarily due to a combination of factors, including low fuel lubricity, air in the pump, fuel contamination, and internal wear.  Metal shavings from internal pump parts are created and enter the high pressure fuel system, damaging injectors and other fuel system components.  Once the metal shavings start it is a snowball effect that escalates rapidly.

• Low Fuel Lubricity:
  The CP4 pump relies on the diesel fuel to lubricate its internal components. When fuel lacks sufficient lubricity (due to factors like low-quality fuel or improper fuel additives), this lubrication is inadequate, leading to accelerated wear and tear.
• Fuel Contamination:
  Contamination from dirt, water, or other debris can damage the pump’s delicate internal components, leading to premature failure.
• Air in the Pump:
  Air trapped in the fuel system can cause the pump to operate in a condition where metal-on-metal contact occurs, further exacerbating wear and potentially leading to catastrophic failure.
• Internal Wear:
  Even with good fuel and proper maintenance, the CP4 pump, like any mechanical component, can wear out over time, particularly under demanding operating conditions.  Normal life for a pump with clean fuel is 100,000 to 150,000 miles.
• Metal Shavings:
  When the CP4 pump begins to fail, it produces metal shavings, which in turn make more metal shavings that will contaminate the entire fuel system, including the injectors, fuel lines, and fuel rails.

Preventing CP4 Failure:

Several measures can be taken to minimize the risk of CP4 pump failure:

• Use High-Quality Fuel:
  Always use reputable fuel brands with adequate lubricity, plus use a fuel additive like the Stanadyne Performance Formula to insure adequate lubricity every time you fill up.
• Maintain the Fuel System:
  Regularly check and replace fuel filters, drain the water separator, and consider using fuel additives to improve lubricity and clean the fuel system.
• Avoid Running Out of Fuel:
  Running the fuel tank low can create air in the system, leading to accelerated wear.
• Consider Aftermarket Solutions:
  Some owners choose to install aftermarket lift pumps like FASS Fuel Systems or secondary filtration kits to enhance fuel delivery and protect against debris.  Also we offer CP3 pump conversion kits which allow the use of the more reliable CP3 style injection pumps.

Compatible Vehicles;

2011 Chevrolet Silverado 2500 HD 6.6L V8 DIESEL

2012 Chevrolet Silverado 2500 HD 6.6L V8 DIESEL

2013 Chevrolet Silverado 2500 HD 6.6L V8 DIESEL

2014 Chevrolet Silverado 2500 HD 6.6L V8 DIESEL

2015 Chevrolet Silverado 2500 HD 6.6L V8 DIESEL

2016 Chevrolet Silverado 2500 HD 6.6L V8 DIESEL

2011 Chevrolet Silverado 3500 HD 6.6L V8 DIESEL

2012 Chevrolet Silverado 3500 HD 6.6L V8 DIESEL

2013 Chevrolet Silverado 3500 HD 6.6L V8 DIESEL

2014 Chevrolet Silverado 3500 HD 6.6L V8 DIESEL

2015 Chevrolet Silverado 3500 HD 6.6L V8 DIESEL

2016 Chevrolet Silverado 3500 HD 6.6L V8 DIESEL

2011 GMC Sierra 2500 HD 6.6L V8 DIESEL

2012 GMC Sierra 2500 HD 6.6L V8 DIESEL

2013 GMC Sierra 2500 HD 6.6L V8 DIESEL

2014 GMC Sierra 2500 HD 6.6L V8 DIESEL

2015 GMC Sierra 2500 HD 6.6L V8 DIESEL

2016 GMC Sierra 2500 HD 6.6L V8 DIESEL

2011 GMC Sierra 3500 HD 6.6L V8 DIESEL

2012 GMC Sierra 3500 HD 6.6L V8 DIESEL

2013 GMC Sierra 3500 HD 6.6L V8 DIESEL

2014 GMC Sierra 3500 HD 6.6L V8 DIESEL

2015 GMC Sierra 3500 HD 6.6L V8 DIESEL

2016 GMC Sierra 3500 HD 6.6L V8 DIESEL