Product Description
CUMMINS 3905307 OEM FUEL INJECTOR RETURN LINE BANJO BOLT – 5.9L 12-VALVE (1989–1998) is the genuine banjo connector screw that seals the fuel injector return (leak-off) line on your 5.9L 12-valve Cummins, restoring factory-tight reliability on Ram 2500/3500 work trucks and performance builds.
Why Choose Genuine Cummins 3905307?
- Direct OE replacement banjo bolt for the fuel injector return (leak-off) line on 5.9L 12-valve Cummins engines.
- Correct thread, length, and sealing surfaces to maintain proper fuel return pressure and leak-free operation.
- OE-grade corrosion-resistant finish built to survive harsh underhood environments.
- Sold individually so you can replace a single bolt or all six positions during a refresh.
- Backed by Cummins quality and CPP Diesel’s diesel-focused inventory and support.
Fitment Details
Automotive – Dodge Ram:
- 1989–1993 Dodge Ram 2500/3500 – 5.9L 6BT 12-Valve Cummins (VE rotary pump)
- 1994–1998 Dodge Ram 2500/3500 – 5.9L 6BT 12-Valve Cummins (Bosch P7100)
Industrial / Off-Highway:
- Common on non-certified B-series 5.9L and related 4BT/6BT/6CT applications.
- Always verify by engine serial number (ESN) before ordering for industrial or generator sets.
Location: Banjo connector screw securing the fuel injector return (leak-off) line at the cylinder head/injector area.
Cross-Reference & Related Cummins Parts (Sold Separately)
- CUMMINS 3926103 OEM FUEL INJECTOR RETURN LINE – RAM 5.9L 12-VALVE (1994–1998)
- CUMMINS 4942278 OEM FUEL INJECTOR RETURN LINE BANJO SEAL (WASHER) – RAM 5.9L 12-VALVE (1994–1998)
- CUMMINS 3923171 OEM FUEL INJECTION PUMP RETURN LINE (FUEL DRAIN TUBE) – RAM 5.9L 12-VALVE (1994–1998)
- CUMMINS 3866798 OEM INJECTOR FUEL SUPPLY LINE SET – 5.9L 12-VALVE (1994–1998)
- CUMMINS 3936691 OEM P7100 FUEL SUPPLY LINE / TUBE – FILTER-TO-PUMP – 5.9L 12V (1994–1998)
Note: These links point to genuine Cummins components on CPP Diesel that are commonly serviced with the 3905307 banjo bolt during fuel system refreshes.
What’s Included
- (1) Genuine Cummins Fuel Injector Return Line Banjo Bolt – Part #3905307
Sealing washers, return lines, and additional hardware are sold separately (see related Cummins parts above).
Installation Notes
- Work on a cool, clean engine to avoid contamination of the fuel system.
- Inspect the return line and sealing washers; replace any components that show corrosion, pitting, or deformation.
- Tighten the banjo bolt evenly to factory torque spec; avoid over-tightening to prevent crushing the banjo or washers.
- After first heat cycle, recheck for any signs of seepage and retorque if necessary.
Specifications for cummins 3905307
| Brand | Cummins |
|---|---|
| Part Number | 3905307 |
| UPC | Not specified by manufacturer |
| GTIN | Not listed |
| Product Type | Fuel injector return line banjo bolt (banjo connector screw) |
| Engine Compatibility | 5.9L 6BT 12-Valve Cummins (1989–1998 Ram 2500/3500); select 4BT/6BT/6CT and non-certified B-series applications (verify by ESN) |
| Cross Reference | Cummins 3902173, 3918188, 3903380; PAI 042179; commonly paired in kits with seal 4942278 (reference only – order by Cummins 3905307 for this listing). |
| E-Codes | Not specified |
| Material | OE-grade steel hardware with corrosion-resistant finish |
| Quantity Per Engine | 6 (sold individually) |
| Shipping Info | Ships from CPP Diesel; small parcel; shipping calculated at checkout; compact hardware item suitable for combining with other Cummins parts. |
| Prop 65 | No specific Proposition 65 warning listed for this part; always follow standard shop safety practices. |
FAQ
HOW MANY OF THESE BANJO BOLTS DOES A 5.9L 12-VALVE USE?
The 5.9L 12-valve Cummins uses six of these banjo bolts on the injector return (leak-off) line—one at each injector location. This listing is for a single genuine Cummins bolt.
WILL THIS FIT MY 1989–1998 DODGE RAM 2500 OR 3500 WITH THE 5.9L CUMMINS?
Yes. Cummins 3905307 is the correct OEM fuel injector return line banjo bolt for 1989–1998 Ram 2500/3500 trucks equipped with the 5.9L 12-valve Cummins. Always confirm fitment by VIN or engine serial number when possible.
IS THIS THE SAME AS A "BANJO CONNECTOR SCREW"?
Yes. Cummins identifies this part as a banjo connector screw. In practice, it functions as the banjo bolt that clamps the return line and sealing washers to the cylinder head or injector housing.
SHOULD I REPLACE THE SEALS AND RETURN LINE AT THE SAME TIME?
It is highly recommended. The banjo seal (washer) and fuel injector return line are exposed to the same heat and vibration as the bolt. For a complete, leak-free repair, pair this bolt with a fresh return line and seals: Cummins 3926103 return line and Cummins 4942278 banjo seal.
IS THIS A GENUINE CUMMINS PART OR AFTERMARKET?
This is a genuine Cummins 3905307 banjo connector screw sourced through CPP Diesel. Using true OEM hardware helps maintain factory sealing, durability, and long-term reliability of your fuel system.
