Engineered specifically for 2003 through 2007 Dodge Ram 2500 and 3500 trucks powered by the 5.9L 24-valve common-rail Cummins turbo diesel engine, the Industrial Injection Stage 1 CP3 "Bag of Parts" (Part # 237702) provides an accessible, cost-effective do-it-yourself modification for factory high-pressure fuel pumps. While standard factory Bosch CP3 pumps deliver adequate pressure for stock power levels, they struggle to sustain commanded rail pressure once aggressive tuning, tow files, or mild performance injectors are introduced. Dropping common-rail pressure extends injection duration, spikes exhaust gas temperatures (EGTs), and limits usable mid-to-high RPM power.

The Stage 1 Bag of Parts overcomes factory internal metering restrictions without the steep financial commitment of purchasing a complete aftermarket stroker pump. Precision-machined using electrical discharge machining (EDM) processes, the upgraded internal components increase high-pressure fuel delivery volume by approximately 19%, comfortably supporting power gains of up to 50+ horsepower. Designed for convenience, the kit installs directly into the pump while it remains mounted to the engine block—eliminating the need to remove the CP3 pump, break into the front timing cover, or pull the drive gear. Because this upgrade modifies the existing pump hardware, there are no core charges, no core returns, and zero vehicle downtime.

Key Features & Benefits

• ~19% Increase in Fuel Delivery Volume: Relieves factory CP3 internal bottlenecks to deliver 19% more fuel volume, preventing wide-open-throttle rail pressure drop.
• Supports 50+ Additional Horsepower: Provides the necessary high-pressure fueling volume to comfortably support street tunes, tow files, and mild injector upgrades.
• No Pump Removal Required: Installs directly on the truck in minutes without removing the CP3 from the engine block, saving hours of labor.
• Precision EDM-Modified Internals: Built using brand-new internal elements modified via precision electrical discharge machining for exact flow matching and durability.
• Cost-Effective Alternative: Achieves moderate high-pressure volume increases at a fraction of the cost of a complete replacement stroker pump.
• Zero Core Charge: Do-it-yourself component kit that requires no core deposit, no core return shipping, and no core inspection delays.

Technical Specifications

• Manufacturer / Brand: Industrial Injection Diesel Performance
• Manufacturer Part Number / SKU: 237702
• Alternative Part Numbers: 237702-IIS / IIS-237702 / IND-237702
• UPC: 840256901849
• Product Series: CP3 Stage 1 "Bag of Parts" (BOP) Series
• Flow Volume Gain: Approximately +19% Fuel Volume Over Stock
• Horsepower Support: Supports Up to +50 HP Gains (Ideal for 500–550 RWHP total builds)
• Manufacturing Process: Precision Electrical Discharge Machined (EDM) Internal Components
• Pump Removal Needed: No (Installs on-engine)
• Truck Platform: 2003–2007 Dodge Ram 2500 & 3500
• Engine Platform: 5.9L 24V Cummins Common-Rail Turbo Diesel
• Base Pump Fitment: Factory Original Equipment Bosch 5.9L CP3 Injection Pump
• Core Requirement: None
• Warranty: Industrial Injection 1-Year Limited Warranty

Vehicle Fitment & Technical Installation Notes

• 2003–2007 Dodge Ram 2500 – 5.9L Cummins 24V Common-Rail Diesel
• 2003–2007 Dodge Ram 3500 – 5.9L Cummins 24V Common-Rail Diesel
• Fits Model Years: 2003, 2004, 2004.5, 2005, 2006, 2007
• Injector Pairing Guidelines: Recommended for use with stock injectors up to 50HP–60HP (or 10% over) performance injectors. When paired with aggressive race tuning files, injectors larger than 60HP are not recommended, as overall system demand will exceed the 19% volume increase.
• Low-Pressure Lift Pump Recommendation: To protect high-pressure plungers from cavitation and maximize the 19% volume gain, pairing with an aftermarket electric lift pump delivering 100 to 165 GPH (FASS or AirDog) at 10–15 PSI is strongly advised.
• Installation Cleanliness: Clean the exterior of the CP3 pump thoroughly before beginning disassembly. High-pressure common-rail components have microscopic clearances; prevent dirt, grime, or lint from entering open fuel cavities during installation.