Product Description
Unlock consistent fuel delivery and keep the power on tap with the FLEECE FPE-DMAX-CP3K DURAMAX CP3K—a modified LBZ CP3 engineered to eliminate the factory fuel flow restriction that starts around 3,000 RPM, so you hold commanded rail pressure across the entire rev range. Ideal for towing, street performance, and daily driving where reliability matters.
Why CP3K?
- Maintains desired rail pressure beyond 3,000 RPM for stronger top-end power
- Brand-new Bosch CP3 (no core charge) for OE-level reliability
- Direct, cost-effective upgrade over a stock LBZ/LMM CP3
The behavior and application notes are confirmed by Fleece’s official listing.
Fitment
Engine/Platform: 6.6L Duramax LBZ/LMM
Vehicles: 2006–2010 Chevy/GMC 2500/3500 HD (LBZ, LMM)
Notes: When retrofitting to 2001–2005 LB7/LLY, the fuel pressure regulator scaling must be adjusted per Fleece guidance.
Cross-Reference / Related Fleece Items (CPP Diesel)
- FLEECE FPE-DMAX-CP3-10MM — PowerFlo 750 CP3 (Duramax)
- FLEECE FPE-DMAX-CP3 — Replacement CP3 for LBZ/LMM
- FLEECE FPE-LML-CP3-10 — LML CP3 Conversion Kit (Heavy Duty CP3)
- FLEECE FPE-LML-CP3-WP — LML CP3 Conversion Kit (with CP3)
- FLEECE FPE-LML-CP3-NP — LML CP3 Conversion Hardware Kit (No Pump)
- FLEECE FPE-DMAX-CP3-ADPT — CP3 Adapter (Duramax)
- FLEECE FPE-HAR-CP3-EXT — CP3 Regulator Extension Harness
- FLEECE FPE-LML-HS-FEED — CP3 Feed Hose (LML Conversion)
- FLEECE FPE-LML-HS-RTRN — CP3 Return Hose (LML Conversion)
CP3K prevents the high-RPM fuel flow drop seen in stock pumps, helping you hold commanded rail pressure for better power and drivability.
Do I need tuning?
No special tuning is required for basic CP3K operation on LBZ/LMM. If installing on LB7/LLY, follow Fleece’s regulator scaling guidance.
Is there a core charge?
No—this unit is supplied as a brand-new Bosch CP3.
Will it support future upgrades?
Yes. CP3K is an excellent foundation and pairs well with Fleece’s higher-output PowerFlo 750 CP3 and LML CP3 conversion components listed above.
Specifications for FLEECE FPE-DMAX-CP3K
| Attribute | Value |
|---|---|
| Brand | Fleece Performance Engineering |
| Part Number | FPE-DMAX-CP3K |
| UPC | 635909310488 |
| GTIN | 00635909310488 |
| Compatibility | 2006–2010 Chevy/GMC 2500/3500 HD (Duramax LBZ/LMM). LB7/LLY retrofit requires regulator scaling. |
| Cross Reference | FPE-DMAX-CP3-10MM; FPE-DMAX-CP3; FPE-LML-CP3-10; FPE-LML-CP3-WP; FPE-LML-CP3-NP; FPE-DMAX-CP3-ADPT; FPE-HAR-CP3-EXT; FPE-LML-HS-FEED; FPE-LML-HS-RTRN |
| E-codes | Not applicable |
| Shipping Method | Free Ground Shipping (small parcel) |
| Package Dimensions / Weight | Approx. 10" W × 8" H × 10" D (as listed) |
| Country of Origin | Not specified |
| Prop 65 | Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
