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Product Details

Description

This Product has been Discontinued

Please click here for an updated version.

Fits: 2011 - 2016 GM Duramax LML 6.6L

Upgrade Your LML's Fuel System: CP4 to CP3 Conversion

The stock CP4 can only handle up to about 500rwhp. In contrast, the CP3K can support 600+ rwhp when paired with piezoelectric injectors. The reliable PowerFlo 750 can even support nearly 850+ rwhp.

The CP4 was introduced to cut costs on the LML platform as the efficient piezoelectric injectors need less fuel. But it's less reliable and capable than the CP3 used in older Duramax models. It's also the reason for a class - action lawsuit against GM due to pump failures in the LML that cause major fuel system breakdowns.

Features

High - Pressure Fuel Rail Line
Fuel Rail Plug and Nut
CP3 Block Adapter with O - ring
(3) CP3 Block Adapter Bolts (Flange Head, M8x1.25x35mm)
CP3 Pump Fittings – 3/8”
CP3 Pump Fittings – 1/2”
(2) Sealing Washers
Low - Pressure Fuel Feed Line
3/8”x8” Flexible Fuel Line with Hose Clamps (CP3 Return)
1/2”x30” Flexible Fuel Line with Hose Clamps (Filter to CP3)
3/4” P - Clamp
Fuel Return Line Block Off with O - ring

Installation

Installation Instructions

This Duramax LML CP3 conversion kit is for 2011 - 2016 GM Duramax LML 6.6L vehicles. To use it, follow the included installation instructions carefully. First, make sure your vehicle is turned off and cooled down. Then, start replacing the CP4 fuel system components with the ones in this kit. When installing the parts, like the CP3 block adapter and fuel lines, use the right tools and tighten the bolts properly. As for maintenance, regularly check the fuel lines for any signs of leaks or damage. If you notice any issues with the fuel system performance, such as reduced power or strange noises, have the system inspected. Also, keep the fuel filter clean and replace it as recommended by the vehicle's maintenance schedule. This will help ensure the long - term reliability of your upgraded fuel system.