Product Description
Easy CP3 volume upgrade without pulling the pump. The INDUSTRIAL INJECTION 438403 Stage 1 CP3 “Bag of Parts” is a DIY kit for 2006–2010 Duramax LBZ/LMM that increases fuel supply volume—perfect for trucks with mild injectors and tuning that need a little more rail to stay clean and consistent.
Fitment
- 2006–2007 LBZ 6.6L Duramax (Silverado/Sierra 2500HD/3500HD)
- 2007.5–2010 LMM 6.6L Duramax (Silverado/Sierra 2500HD/3500HD)
What’s Included
- Stage 1 CP3 internal components (“bag of parts”) for factory pump
- Install hardware as supplied by Industrial Injection
Why It Works
- Increases CP3 output volume for improved rail stability on mild injector/tune setups
- DIY-friendly: can be installed with the CP3 still on the engine (experienced users/shops recommended)
- Cost-effective alternative to a full CP3 replacement when only a modest bump is needed
Recommended Parts (CPP Internal Links Only)
- GM DURAMAX CP3 PUMPS & COMPONENTS — pair this kit with a healthy or upgraded CP3 if your pump is tired.
- XDP XD523 REMANUFACTURED CP3 (06–10 LBZ/LMM) — OE-spec replacement pump option.
- S&S NEW LBZ-BASED CP3 (01–10) — brand-new Bosch-based pump for clean, reliable rail.
- DURAMAX LIFT PUMPS — add an AirDog/FASS supply to protect the CP3 and stabilize inlet pressure.
- FUEL RAIL / RELATED — relief valves, plugs, and fittings to finish the system right.
Helpful Notes
- Intended for mild injector/tune builds. For larger injectors or high-RPM power, step up to a stroker/new CP3.
- Professional installation recommended. Cleanliness is critical when opening a high-pressure pump.
- Pair with a quality lift pump to maintain supply pressure and extend CP3 life.
Cross-Reference / Alternatives
- BOSTECH HPP7332 REMAN CP3 (06–10 LBZ/LMM)
- S&S 12MM STROKER CP3 (LBZ-BASED) — for higher-output single-pump builds.
FAQ
How much more fuel does this Stage 1 kit provide?The Stage 1 “bag of parts” increases the CP3’s volume to better support mild injector and tune upgrades, improving rail pressure stability compared to stock.
Do I have to remove the CP3 from the engine?Many installers complete the upgrade with the pump still on the engine. However, this is precision work—experienced DIYers or professional shops are recommended.
When should I choose a full CP3 instead?If your existing pump is worn, or you’re running larger injectors/high RPM, a reman or new performance CP3 (see alternatives above) is the better choice.
Is a lift pump required?Strongly recommended. A quality lift pump helps the CP3 maintain inlet pressure, reduces cavitation, and extends pump life—especially with added volume.
