Product Description
S&S Diesel CP3-DMX-12-HS – High-Speed 12mm CP3 for LB7/LLY/LBZ
Built on a brand-new LBZ-based Bosch pump and optimized for high RPM fueling, the S&S Diesel CP3-DMX-12-HS delivers 1,590 mm³/rev displacement with high-speed internals for strong, consistent rail pressure in single-pump performance builds.
Key Features
- Brand-new LBZ-based CP3 (not reman)
- High-speed optimized 12mm stroker – 1,590 mm³/rev displacement
- Excellent high-RPM fueling stability for competition or street/strip builds
- Direct bolt-on for listed platforms; quality you expect from S&S
Fitment
- 2001–2010 GM Duramax 6.6L LB7 / LLY / LBZ
Notes: Custom tuning is required on 2001–2005 (LB7/LLY). A quality lift pump is strongly recommended on all applications.
What’s Included
- 1 × New S&S Diesel CP3-DMX-12-HS pump (LBZ-based)
Does not include lines, fittings, rail, or installation accessories unless stated above. Reuse OE hardware where applicable or add recommended parts below.
Recommended Parts
- GM Duramax Lift Pumps (Airdog, FASS, Fleece) – ensure consistent supply to the CP3
- AirDog II-5G DF-165 (01–10 Duramax) – proven 165 GPH system
- PPE CP3 Fuel Feed Line Kit (01–10) – upgraded 1/2" feed for maximum flow
- More GM CP3 Pumps & Components – lines, regulators, install parts
- Shop All S&S Diesel at CPP
Why Buy From CPP Diesel
- Duramax specialists — real-world fitment help for LB7/LLY/LBZ
- Fast shipping & knowledgeable support
- Only trusted brands like S&S Diesel Motorsport
FAQ
What’s the difference between the 12mm “HS” and a standard 12mm CP3?The “HS” (High Speed) version is optimized for high-RPM operation while maintaining displacement (1,590 mm³/rev). It’s the choice for builds that live higher in the rev range and need stable rail pressure under sustained load.
Do I need a lift pump with this CP3?
Yes, we strongly recommend a quality lift pump for reliable supply and pressure to the CP3, especially on tuned or high-power setups. See our Duramax Lift Pump category.
Is custom tuning required?
Custom tuning is required on 2001–2005 LB7/LLY trucks. Later platforms typically benefit from calibration review when increasing pump capacity.
Will this fit LMM or LML?
This listing targets 2001–2010 LB7/LLY/LBZ. For LMM/LML solutions or CP3 conversions, contact us and check our GM CP3 category for dedicated options.
What about warranty?
S&S Diesel Motorsport CP3 pumps carry a manufacturer warranty. Keep proof of purchase and follow install best practices (clean fuel, correct supply pressure).
