Product Description
The CUMMINS 3957079 OEM FUEL RAIL SUPPLY LINE (CP3 TO RAIL) is designed for 2003–2007 Dodge Ram trucks equipped with the 5.9L Common Rail Cummins diesel engine. This genuine Cummins high-pressure fuel line connects the CP3 injection pump to the fuel rail and is engineered to maintain proper fuel delivery and system performance.
Use this part when replacing a damaged, leaking, corroded, or contaminated fuel supply line. Because this line operates under extremely high fuel pressure, replacement with a genuine Cummins component is recommended to ensure proper fitment and reliability. Always verify fitment by engine serial number before ordering.
FEATURES
- Genuine Cummins OEM fuel rail supply line
- Connects the CP3 injection pump to the common rail
- Direct-fit replacement for factory-installed fuel line
- Designed for high-pressure common rail fuel systems
- Helps restore proper fuel delivery and system integrity
- Ideal for repair, maintenance, or fuel system service
FITMENT
- 2003–2007 Dodge Ram 2500 5.9L Cummins Common Rail
- 2003–2007 Dodge Ram 3500 5.9L Cummins Common Rail
- 5.9L ISB Cummins equipped with Bosch CP3 injection pump
WHAT'S INCLUDED
- 1 Cummins 3957079 OEM Fuel Rail Supply Line
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3957079
- CP3 Injection Pump Components
- Common Rail Fuel Rail Components
- High-Pressure Injector Lines
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3957079
- Part Type: Fuel Rail Supply Line
- Fuel System Type: Common Rail
- Connection: CP3 Injection Pump to Fuel Rail
- Engine Compatibility: 5.9L Cummins Common Rail
- Fitment Years: 2003–2007
- Vehicle Application: Dodge Ram 2500 / 3500
- Condition: New OEM Cummins
- Installation Type: Direct Replacement
FAQ
Will this part fit my truck?
This fuel rail supply line fits many 2003–2007 Dodge Ram 2500 and 3500 trucks equipped with the 5.9L Common Rail Cummins engine. Always verify fitment by engine serial number before ordering.
Is this a genuine Cummins fuel line?
Yes. Cummins 3957079 is a genuine OEM Cummins high-pressure fuel rail supply line.
What does this line connect?
This line connects the Bosch CP3 injection pump to the common rail, allowing high-pressure fuel to be delivered to the rail for injector operation.
When should this line be replaced?
Replacement is recommended if the line becomes damaged, bent, corroded, contaminated, or develops a fuel leak.
Can I reuse an old high-pressure fuel line?
Inspect all high-pressure fuel lines carefully during service. Follow Cummins service procedures regarding reuse or replacement requirements.
Do I need any related parts?
Inspect the CP3 injection pump, fuel rail, injector lines, fuel pressure relief valve, and associated fuel system components during installation and replace worn parts as necessary.
