Product Description
Industrial Injection 237603 Fuel Rail Plug - 5.9L Cummins
Stop rail-pressure drop caused by a tired PRV. Industrial Injection's 237603 Fuel Rail Plug replaces the factory pressure relief valve on 2003-2007 5.9L Cummins common-rail engines. Machined from 304 stainless and backed by a 1-year warranty, it's a simple, proven reliability upgrade for tuned or stock trucks alike.
Fitment
- 2003-2007 Dodge Ram 2500/3500 - 5.9L Cummins (Common Rail)
- Direct replacement for the factory rail pressure relief valve (PRV)
Why It Works
The OEM PRV can open prematurely as the spring weakens, bleeding off rail pressure and causing hard starts, low power, and inconsistent fueling. This plug eliminates that bleed path to help maintain commanded rail pressure. (Always verify commanded vs. actual rail pressure during tuning.)
Specifications
| Brand | Industrial Injection |
|---|---|
| Part Number | 237603 |
| Material | 304 Stainless Steel |
| Warranty | 1 Year |
| UPC | 840256907698 |
| GTIN | 840256907698 (GTIN-12) |
| Emissions/Use | Verify local laws; for competition/off-road use where applicable |
| Prop 65 | Yes - Cancer and reproductive harm |
Recommended Parts & Helpful Links
- 5.9L Cummins CP3 Pumps - pair the rail plug with a healthy high-pressure pump.
- 5.9L Cummins Injectors - address low-pressure symptoms at the source.
- Rail Pressure Sensors - replace aging sensors when diagnosing rail issues.
- Fuel Filters & Filtration Upgrades - keep contaminants from damaging the rail system.
- More Industrial Injection 5.9L Cummins Parts
Install Notes
- Always torque to spec and check for leaks at first start.
- Monitor commanded vs. actual rail pressure after install.
FAQs
Will this increase my commanded rail pressure?No. It removes the factory relief path so the system can hold the pressure your ECM/tune commands. It does not raise the commanded value by itself.
Is tuning required?No tuning is strictly required for stock trucks, but tuning may be present on many builds using this part. Always verify rail pressure with a scan tool.
Is this legal for on-road use?Legality varies by jurisdiction. Check local and federal emissions laws. Intended for competition/off-road use where permitted.
What symptoms indicate a weak PRV?Hard starts, low power under load, rail pressure codes, and logs showing actual rail pressure dropping below commanded.
What's it made of and what's the warranty?Machined 304 stainless steel with a 1-year warranty from Industrial Injection.
