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

• Fuel Injectors
  • 03–07 Injectors (Category)
  • Dynomite Diesel (DDP) Sets & Nozzles
• CP3 Injection Pumps
  • CP3 Injection Pumps — Stock & Performance
  • Stock Replacement CP3 Pumps
  • CP3 Components (FCA, rail plugs, reliefs)
• Dual CP3 Kits & Hardware
  • Dual CP3 Kits & Brackets (03–07)
• Lift Pumps & Air/Fuel Separation
  • 03–07 Lift Pumps (Category)
  • AirDog Systems • FASS Systems
  • aFe DFS780 PRO System (03–04)
• Filtration, Filters & Deletes
  • Fuel Filtration (Filters & Accessories)
  • Fleece Fuel Filter Delete (03–07)
  • Fleece Auxiliary Fuel Filter Kit (03–18)
• Fuel Rails, Sensors & Relief
  • Fuel Rails (Category)
  • Cummins 3947799 Pressure Relief Valve • BD 1050070 Rail Plug
  • Cummins 5297641 Rail Pressure Sensor
• Lines, Big Line Kits & Distribution
  • Fuel Injection Lines (Category)
  • BD 1050331 1/2" Flow-Max Line Kit
  • Mopar 5086810AA Fuel Rail Return Line
  • Fleece Fuel Distribution Block • BD 1050370 Fuel Distribution Block • FASS CFDB1001K Distribution Block
• Injector Connector Tubes & Hardware
  • XDP XD526 Connector Tube (03–07)
  • Cummins 3957081 #1 Injection Line
• FCA & Related Electronics
  • Cummins 4932457 Fuel Control Actuator (FCA)
  • CPP 4932457 FCA

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.