Product Description
Industrial Injection 0986437308DDSE “Double Dragon 120” CP3 Injection Pump for 2004.5–2005 GM 6.6L Duramax LLY
Turn the LLY fuel system into a reliable performer. The Industrial Injection 0986437308DDSE “Double Dragon 120” is a high-flow, remanufactured CP3 built for 2004.5–2005 Duramax LLY trucks that need more supply for larger injectors and upgraded turbos—without sacrificing drivability. It’s a direct bolt-in replacement for the factory CP3 on LLY applications and is assembled, calibrated, and tested to rigorous standards.
Fitment
- 2004.5–2005 Chevrolet Silverado 2500HD/3500HD — 6.6L Duramax LLY
- 2004.5–2005 GMC Sierra 2500HD/3500HD — 6.6L Duramax LLY
- Notes: Fits mid-year split “LLY” only (VIN code 2). Not for LB7, LBZ, LMM, LML, or L5P.
Why Buy From CPP Diesel
- LLY experts with real-world install guidance
- Fast shipping and careful core handling
- Only trusted brands like Industrial Injection
What’s Included
- 1 × Industrial Injection 0986437308DDSE “Double Dragon 120” CP3 pump (remanufactured)
- Installation seals (as supplied by manufacturer)
- Core return instructions
Recommended Supporting Parts
- Lift Pump (AirDog/FASS category) — Helps prevent CP3 starvation and supports higher power
- High-Efficiency Fuel Filter Kit — Protects your new CP3 from contamination
- Fuel Pressure Regulator/Relief Upgrades — Stabilizes rail pressure under load
- Turbocharger Upgrades & Accessories — Pair with higher-flow turbos for balanced airflow/fuel
- More CP3 Pumps & Accessories — Browse related components
Specifications
| Brand | Industrial Injection |
| Manufacturer Part # | 0986437308DDSE |
| Pump Type | Remanufactured Bosch-based CP3 (High-Flow) |
| Application | 2004.5–2005 GM 6.6L Duramax LLY (VIN 2) |
| Core Charge | Yes – refundable upon receipt of an acceptable core |
| UPC | N/A (manufacturer does not publish) |
| GTIN | N/A |
| Prop 65 | WARNING: Cancer and Reproductive Harm. See California Prop 65 information. |
| Warranty | Manufacturer limited warranty; terms apply |
Install & Tuning Notes
- Direct bolt-in on LLY CP3-equipped trucks; standard install practices apply.
- Ensure a clean fuel system and fresh filters prior to install.
- Recommended to pair with a quality lift pump on performance builds.
Cross-References & Alternatives
Looking for other CP3 options or stock-flow replacements? Shop our CP3 Injection Pumps category for alternatives that fit your goals and budget.
FAQ
Will this work on my 2004 Duramax?This pump fits the mid-year 2004.5–2005 Duramax LLY only (VIN code 2). It will not fit LB7 (2001–early 2004) or other generations.
Do I need a lift pump with the Double Dragon 120?While not strictly required on a stock truck, a quality lift pump is strongly recommended for performance builds to maintain consistent supply and protect the CP3.
Is tuning required after installation?Many customers run this pump on factory calibration, but custom tuning may help you fully realize the benefits when combined with larger injectors or turbo upgrades.
Is there a core charge?Yes. A refundable core charge applies. Return an acceptable core promptly to receive your refund.
What about emissions and Prop 65?Always follow local emissions laws. California Proposition 65: WARNING – Cancer and Reproductive Harm.
Helpful Notes
- Verify VIN and engine code (LLY) before ordering.
- If your goal is stock-like drivability with more headroom, this pump is a strong foundation to pair with proper airflow and filtration.
