FLEECE FPE-CP3X2 2003-2016 CUMMINS CP3X2 HARNESS

Unleash the full potential of your 2003-2016 Cummins equipped diesel engine with the FLEECE FPE-CP3X2 harness—the ultimate dual pump wiring solution from Fleece Performance Engineering. Designed for serious builds, this plug-in harness empowers your ECM to precisely control dual CP3 fuel pumps—eliminating the need for expensive external pump controllers. Fleece CP3X2 harness, Cummins dual CP3 wiring, 2003-16 Cummins CP3X2, Fleece wiring harness, dual pump Cummins tuning, CPP Diesel FPE-CP3X2

Key Benefits

• Dual CP3 pump control via your OEM ECM for cleaner installs and fewer components.
• Optimized for serious fuel system upgrades and heavy-duty/competition use.
• Works seamlessly across 2003-2016 Cummins 5.9L/6.7L with CP3X2 dual pump setups.
• Manufactured by Fleece Performance Engineering to their rigorous quality and reliability standards.

Fitment

Engines & Years: 2003-2016 Cummins (5.9L & 6.7L) equipped with dual CP3 (CP3X2) fuel pump systems. Vehicle Types: Dodge/Ram 2500 & 3500 (and related heavy-duty trucks) configured with CP3X2 dual fuel pump setups.

Cross-Reference / Related Fleece Items (CPP Diesel)

• FLEECE FPE-DUAL-CP3X3 (2003-2016 Cummins Dual CP3X3 Harness)
• FLEECE FPE-CP3X1 (2003-2016 Cummins CP3X1 Harness)
• FLEECE FPE-HAR-GM-NSBU-0104 (GM Allison NSBU Pigtails 2001-04)

The harness enables your ECM to control two CP3 fuel pumps independently by wiring into the existing CP3X2 setup. This means you can dial in current (via FCA table D0787) to manage fuel flow precisely. More current = less flow; less current = more flow. :contentReference[oaicite:2]{index=2}

No — with the FPE-CP3X2 harness your OEM ECM becomes the controller. For most builds this eliminates the need for an expensive add-on unit while maintaining fully controllable dual pump operation. :contentReference[oaicite:3]{index=3}

Yes. Tuning is required to get the most out of this harness. Fleece recommends starting by multiplying the stock FCA current table (D0787) by ~1.6-1.7 and then tuning from there based on idle lift-pump pressure and solenoid characteristics. :contentReference[oaicite:4]{index=4}

According to Fleece, the CP3X2 harness can theoretically support up to three CP3 pumps using the 5000 mA driver in the ECM—though this is best reserved for competition use and may shorten driver life. :contentReference[oaicite:5]{index=5}

California Proposition 65 warning applies — see specs below. :contentReference[oaicite:6]{index=6}

Specifications for FLEECE FPE-CP3X2