Product Description
Make reliable power on your LML. The INDUSTRIAL INJECTION 436408 Dual Fueler Kit adds a second CP3 to your 2011–2016 6.6L Duramax LML and includes the pump, brackets, hardware, and lines for a clean, bolt-on install. Splitting the workload between two pumps helps maintain commanded rail pressure under heavy load and tuning, reduces stress on the primary pump, and sets the foundation for larger injectors and advanced calibrations.
Fitment
- 2011–2016 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD — 6.6L Duramax LML
What’s Included
- Complete Dual CP3 bracket & hardware kit for LML
- New CP3 pump included (secondary)
- High-pressure lines / fittings and installation components
- Instructions
Key Notes
- Requires custom tuning to operate correctly with dual pumps.
- Aftermarket lift pump strongly recommended to ensure adequate supply and filtration.
- Will not fit dual-alternator trucks (CP3 occupies the secondary alternator location).
- May require removal of the factory EGR cooler for clearance on some setups.
Recommended Parts (CPP internal links only)
- AirDog II-5G DF-165 (2011–2014 LML) Lift Pump
- AirDog II-5G DF-220 (2015–2016 LML) Lift Pump
- FASS Titanium Signature Series (Duramax) Options
- Duramax CP3 Pumps & Components
- Industrial Injection LML Disaster Kit (post-CP4 failure cleanup)
- Shop All GM Duramax Categories
Helpful Installation Tips
- Verify belt routing and bracket torque per instructions before first start.
- Prime the system thoroughly after adding the lift pump and secondary CP3 to avoid dry-start damage.
- Finish the install with professional calibration to command and balance dual-pump rail pressure.
FAQ
Do I need a lift pump with this dual fueler?Yes—an aftermarket lift pump is strongly recommended to supply adequate low-pressure fuel and improved filtration to both CP3s, especially on tuned or high-load trucks.
Will this work on my dual-alternator LML?No. The secondary CP3 occupies the location of the auxiliary alternator on dual-alt trucks.
Does this kit include tuning?No. You must use custom tuning calibrated for a dual-CP3 configuration to prevent rail pressure errors and drivability issues.
What CP3 pump is included?The kit includes a new CP3 pump as the secondary unit. If you want to tailor flow for your build, consider our CP3 pumps & components category linked above.
