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Air and Fuel› Fuel Pumps, Regulators and Components

S&S Diesel

L5P Duramax CP3 Conversion Kit

Name: L5P Duramax CP3 Conversion Kit
Brand: S&S Diesel
SKU: L5P-CP3

$3,900.00 $2,912.00 Save $988.00

SKU: L5P-CP3

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$100 Minimum Order

Non-Returnable Item

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Moderate — 2–4 hours

Overview

The S&S Diesel L5P Duramax CP3 Conversion is a high-pressure fuel pump upgrade for competition engines. It features a new Bosch base CP3 that has been modified by S&S. This conversion maintains linear output and efficiency up to 4,000 RPM.

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The S&S Diesel L5P Duramax CP3 Conversion offers a robust upgrade for competition-focused L5P Duramax engines. This kit replaces the factory CP4 pump with a modified Bosch CP3, known for its durability and consistent fuel delivery. The S&S-modified CP3 pump is engineered to maintain linear output and efficiency across the RPM range, up to 4,000 RPM, ensuring reliable performance under demanding conditions. This conversion is compatible with the factory supply pump and is available in three configurations: 10mm, 12mm, or 14mm stroker CP3 options, allowing for customization based on specific performance needs. Each unit comes with a comprehensive test report, verifying its performance. The kit is designed to fit 2017 to current GM trucks equipped with the L5P Duramax engine. Installation of this CP3 conversion requires engine tuning and is intended for competition use only. The kit includes all necessary hard lines to connect the CP3 pump to the factory fuel rails, along with feed and return lines. Buyers are advised to download the installation instructions prior to beginning the process.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

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Specifications

Brand	S&S Diesel
Part Number	L5P-CP3
Category	Air and Fuel

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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