Product Description
The CUMMINS 3957081 OEM #1 FUEL INJECTION LINE / INJECTOR FUEL SUPPLY TUBE is designed for 2003–2007 Dodge Ram trucks equipped with the 5.9L Common Rail Cummins diesel engine. This genuine Cummins fuel supply tube delivers high-pressure fuel from the common rail to the number one injector while maintaining proper sealing, fuel delivery, and OEM fitment.
Use this part when replacing a damaged, leaking, corroded, or improperly sealed injector line. Always follow Cummins service procedures and replace fuel connector tubes whenever required during injector service.
FEATURES
- Genuine Cummins OEM fuel injection supply tube
- Designed for the #1 cylinder injector location
- Direct-fit replacement for factory fuel system components
- Supports proper high-pressure fuel delivery
- Helps maintain injector sealing and fuel system performance
- Ideal for injector replacement and fuel system repairs
FITMENT
- 2003–2007 Dodge Ram 2500 5.9L Cummins Common Rail
- 2003–2007 Dodge Ram 3500 5.9L Cummins Common Rail
- 2003–2007 Cummins ISB 5.9L Common Rail applications
WHAT'S INCLUDED
- 1 Cummins 3957081 OEM #1 Fuel Injection Line / Injector Fuel Supply Tube
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3957081
- Common Rail Injector Connector Tubes
- Cummins Fuel Rail Components
- Cummins Fuel Injectors
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3957081
- Part Type: Fuel Injection Line / Injector Fuel Supply Tube
- Cylinder Position: #1
- Engine Compatibility: 5.9L Cummins Common Rail
- Fitment Years: 2003–2007
- Vehicle Application: Dodge Ram 2500 / 3500
- Condition: New OEM Cummins
- Fuel System Type: High-Pressure Common Rail
- Installation Type: Direct Replacement
FAQ
Will this part fit my truck?
This fuel supply tube fits many 2003–2007 Dodge Ram 2500 and 3500 trucks equipped with the 5.9L Common Rail Cummins engine. Always verify fitment using your engine serial number and part number before ordering.
Is this a genuine Cummins part?
Yes. Cummins 3957081 is a genuine OEM injector fuel supply tube manufactured to Cummins specifications.
What does this fuel supply tube do?
This tube transfers high-pressure fuel from the common rail to the number one fuel injector while maintaining proper sealing and fuel delivery.
Should injector tubes be replaced during injector service?
Cummins commonly recommends replacing injector connector tubes whenever injectors are removed or serviced to ensure proper sealing and performance.
What are the symptoms of a damaged fuel supply tube?
Fuel leaks, hard starting, rough operation, low fuel rail pressure, misfires, and fuel system diagnostic trouble codes may indicate a damaged or improperly sealed connector tube.
Do I need any related parts?
Inspect the fuel injector, connector tube nut, fuel rail connections, injector hold-down hardware, and sealing surfaces during installation and replace worn components as necessary.
