Product Description
Genuine Cummins 3923171 OEM Fuel Injection Pump Return Line for the 1994–1998 Dodge Ram 5.9L 12-Valve Cummins. This factory-engineered tube ensures proper fuel return flow from the P7100 injection pump back to the tank, preventing leaks, aeration, and inconsistent fueling issues common with aging original lines.
If your 12-valve is experiencing hard starts, erratic idle, or visible fuel seepage around the injection pump return port, replacing the line with a **true OEM Cummins component** is the correct fix. CPP Diesel supplies only genuine Cummins-packaged parts—never aftermarket copies.
Fitment
- 1994–1998 Dodge Ram 2500/3500
- Engine: 5.9L Cummins 12-Valve
- Fuel System: Bosch P7100 (P-Pump)
Cross-Reference (Cummins-Only)
- Cummins 3935959 Injector Line – 12V
- Cummins 3931573 Fuel Return Banjo Bolt
- Cummins 3914107 Injection Pump Supply Line
Frequently Asked Questions
Is this Cummins 3923171 line a genuine OEM part?
Yes. CPP Diesel sells only authentic OEM Cummins components—no aftermarket copies.
Will this fit all 1994–1998 12-valve trucks?
Yes. It fits all Dodge Ram 2500/3500 models equipped with the 5.9L 12-Valve Cummins and P7100 injection pump.
What symptoms indicate a failing return line?
Fuel leaks, hard starting, erratic idle, and aeration issues can all stem from a damaged return line.
Does this include any seals or hardware?
No. This listing is for the return line only. Hardware sold separately if required.
Specifications
| Specifications for Cummins 3923171 | |
|---|---|
| Brand | Cummins |
| Part Number | 3923171 |
| GTIN | Not Published |
| UPC | Not Published |
| Cross Reference | 3923171, 3923171RX |
| E-Codes | Not Applicable |
| Shipping Info | Ships via standard ground; lightweight small-parts packaging |
| Prop 65 | No California Proposition 65 warning required |
