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  • DODGE CUMMINS
  • FORD POWERSTROKE
  • GM DURAMAX
  • COMMERCIAL / INDUSTRIAL
  • CUMMINS CONVERSION PARTS
  • CPP GEAR
  • USED PARTS
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  • DODGE CUMMINS
  • FORD POWERSTROKE
  • GM DURAMAX
  • COMMERCIAL / INDUSTRIAL
  • CUMMINS CONVERSION PARTS
  • CPP GEAR
  • USED PARTS
  • SHOP BY BRAND

    • Shop by Brand

  • View all Brands

    • FUEL SYSTEM

    Fuel your 2003–2007 Ram 2500/3500 5.9L Cummins with confidence. CPP Diesel curates injectors, CP3 pumps, dual-fueler hardware, lift pumps, filtration, rails/sensors, big line kits, and distribution blocks that fit and perform on the 03–07 common-rail platform.

    Browse the full 03–07 FUEL SYSTEM category

    Shop by Component

    Why Buy Fuel System Parts from CPP Diesel?

    • 03–07 Fitment First: Parts and kits vetted for the 5.9L CR platform, from stock refresh to competition builds.
    • Brand depth: Cummins, Bosch, DDP, Exergy, S&S, Fleece, BD, AirDog, FASS, aFe—one stop for proven components.
    • Use-case guidance: Daily/tow, big single, or dual CP3—we help you match injectors, pump flow, and filtration.

    Tech Notes & Fitment

    • Year split: 2003–2004 vs 2004.5–2007 injectors/nozzles differ—match the year range on the product page.
    • Supply side matters: High-flow lift pumps and 1/2" lines support CP3 life and stable rail pressure under load.
    • Seal & torque: Always use new connector tubes/seals and follow OE torque sequence on rails and lines.

    Frequently Asked Questions

    Do I need a lift pump with larger injectors or a stroker CP3?

    Yes—bigger injectors or CP3s demand more low-pressure supply. A quality AirDog or FASS plus 1/2" lines helps maintain commanded rail pressure and protects the CP3.

    Rail plug vs. pressure relief valve—what’s right for me?

    Stock/tow builds should keep an OE relief valve. Race-only setups may use a plug or high-pressure relief. Always follow local laws and product notes.

    Which injector sets fit my truck—03–04 or 04.5–07?

    Injector part families are year-specific. Check your build date and select the matching 03–04 or 04.5–07 set listed on the product page.

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