S&S LML CP3 Conversion Kit, No Pump | Competition Use Only

The S&S Diesel Motorsports LML CP3 Conversion Kit (without pump) replaces the factory Bosch CP4.2 high-pressure fuel pump on 2011–2016 LML 6.6L Duramax trucks with a CP3. The CP4.2 is a well-known failure point on the LML, and when it fails it can take the rest of the high-pressure fuel system with it. This version includes the conversion hardware without the pump, so you can pair it with a CP3 you already own or a high-output stroker CP3.

Key Features

• S&S Diesel Motorsports part number LML-CP3-WO-PUMP
• Includes the conversion hardware needed to swap from the CP4.2 to a CP3 (pump not included)
• Pairs with a stock-output or high-output stroker CP3 (SS, 10 mm, 12 mm or 14 mm)
• No lift pump required, because the CP3's internal gear pump draws fuel from the tank
• Fits 2011–2016 LML 6.6L Duramax Silverado and Sierra 2500HD/3500HD

Benefits

• Removes the CP4.2, the LML's most common high-pressure fuel system failure point
• Lets you choose the CP3 output that matches your build
• Costs less than a complete kit if you already have a CP3

Tuning

Tuning depends on the CP3 you install. S&S pumps with a custom metering unit matched to the CP4 flow curve need no tuning changes. A pump with an LBZ-based metering unit needs a pump-curve revision in the ECM.

Fitment

• 2011–2016 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
• 2011–2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML

Need a pump? See the S&S Duramax SuperSport CP3, or get everything at once with the S&S CP3 Conversion Kit with Re-Calibrated Pump. For install gaskets, add the CP3/CP4 Fuel Injection Pump Install Gasket Kit, LML.

What's Included

• S&S LML CP3 conversion hardware kit
• CP3 pump not included

Competition use only.