ENGINEERED TO ELIMINATE WARPING, SNAPPED BOLTS, AND TICKING

CHEVY/GM DURAMAX 6.6L 11-16 LML-LGH FUEL SYSTEM

Keep your 2011-2016 Chevy/GMC Duramax LML/LGH running strong with our complete range of fuel system upgrades and replacement parts. Find solutions to common CP4 pump issues, improve filtration, and ensure your engine gets the clean fuel it needs.

  • CP4 Disaster Prevention

    Convert your problematic stock CP4 pump to a robust and reliable CP3 with our complete conversion kits.

  • Clean & Consistent Fuel

    Our Venom and Flow-MaX lift pumps provide superior filtration and constant pressure to protect your injectors.

  • OEM-Quality Replacements

    Find stock remanufactured injectors and high-pressure pumps that meet or exceed factory specifications.

  • Complete System Support

    From high-flow injector lines and tank sumps to replacement filters, we have everything to overhaul your fuel system.

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FIND THE RIGHT LML & LGH FUEL SYSTEMS FOR YOUR TRUCK

Find the right fuel system components for your 2011-2016 Duramax project. Below are some common applications we support for the LML and LGH platforms.

ApplicationEngineCommon YearsTypical ProductBest For
Chevy Silverado / GMC Sierra 2500/3500 HD6.6L LML Duramax2011-2016Venom CP3 Conversion KitPreventing or recovering from CP4 pump failure and supporting performance builds.
Chevy Silverado / GMC Sierra 2500/3500 HD6.6L LML Duramax2011-2016VENOM DURAMAX FUEL LIFT PUMPImproving filtration, air separation, and providing consistent fuel pressure.
Chevy Silverado / GMC Sierra 2500/3500 HD6.6L LML/LGH Duramax2011-2016Injector Stock RemanufacturedCost-effective, OEM-level replacement of one or more failing injectors.
Chevy Silverado / GMC Sierra 2500/3500 HD6.6L LML/LGH Duramax2011-2016Duramax CP4 PumpDirect, stock replacement for a failed factory high-pressure fuel pump.
Universal Diesel TrucksDuramax, Cummins, Power StrokeManyFlow-MaX Tank Sump KitEnsuring a constant fuel supply for aftermarket lift pumps, especially on low tank levels.

WHY LML & LGH FUEL SYSTEMS FAIL AND HOW BD SOLVES IT

The most significant issue for the 2011-2016 Duramax is the factory Bosch CP4.2 high-pressure pump. When it fails, it can send metal debris throughout the entire high-pressure fuel system, destroying the pump, fuel rails, and all eight injectors. This 'disaster' results in a repair bill that can exceed $10,000. The best way to prevent this or recover from it is to replace the CP4 with the much more robust and reliable CP3 pump using one of our complete conversion kits.

  • CP4 Pump Failure

    A sudden loss of power, a loud engine knock, and a check engine light can signal a catastrophic failure that contaminates the entire fuel system with metal shavings.

    The BD Difference

    Our Venom CP3 Conversion Kit replaces the failure-prone pump with a far more durable design to prevent this from happening again.

  • Low Fuel Rail Pressure (P0087)

    This common trouble code indicates the fuel system can't maintain commanded pressure.

    The BD Difference

    It can be caused by a weak CP4 pump, clogged fuel filter, or fuel starvation from a lack of a lift pump.

  • Failing Injectors

    Symptoms include excessive smoke (white or grey), rough idle, engine knocking, and poor fuel economy.

    The BD Difference

    High balance rates on a scan tool can help identify the failing cylinder.

  • Fuel Starvation Under Load

    When towing or accelerating hard, the truck may hesitate or lose power.

    The BD Difference

    This happens when the stock suction-based system can't supply enough fuel to meet demand.

Why should I convert my 2011-2016 LML Duramax from a CP4 to a CP3 pump?

The CP3 pump is a much more robust and reliable design. Converting to a CP3 with our kit is the best preventative measure against catastrophic CP4 failure, which can destroy your entire fuel system and lead to extremely expensive repairs.

Does my 2011-2016 Duramax have a factory lift pump?

No, the LML and LGH Duramax engines do not have a factory lift pump. The high-pressure CP4 pump is responsible for pulling fuel from the tank, which adds stress and makes an aftermarket lift pump a highly recommended upgrade for reliability and improved filtration.

What are the signs of a failing CP4 pump?

Common symptoms include a P0087 low fuel rail pressure code, engine stumbling or stalling, a noticeable humming or grinding noise from the engine bay, and in the case of total failure, a no-start condition.

Do I need a lift pump on a stock LML Duramax?

While not strictly required for a stock truck to run, a lift pump is highly recommended. It improves fuel filtration, removes air, reduces strain on the CP4 pump, and provides a more consistent fuel supply, extending the life of your entire fuel system.

What's included in the Venom CP3 Conversion Kit for the LML?

Our kits are comprehensive and typically include a brand new or remanufactured CP3 pump, a specific pump mounting adapter, a durable billet aluminum cover plate, high-pressure lines, and all the necessary fittings and hardware for installation.

Are your remanufactured LML injectors tested?

Yes. Every remanufactured injector goes through a rigorous process and is fully tested on a certified Bosch test bench to ensure it meets strict performance, flow, and quality standards before being packaged.