Product Description
CUMMINS 3905351 OEM FUEL RETURN LINE GROMMET SEAL – RAM 5.9L 24V (1998.5–2002)
The genuine CUMMINS 3905351 OEM fuel return line grommet seal is a critical component in the VP44 fuel system used on the 1998.5–2002 5.9L 24-valve Cummins engine. This grommet ensures a tight, leak-free seal where the return line enters its factory port, preventing fuel seepage, air intrusion, and hard-start conditions. Over time, heat and diesel exposure cause the original seal to harden or crack—leading to irritating fuel odors and performance issues.
This OEM Cummins grommet delivers perfect fitment and fuel system reliability. Many VP44 driveability problems trace back to small leaks in the return circuit, making this inexpensive seal a key item during fuel system service. Pair it with a complete inspection of your VP44 feed and return hoses, connectors, and sealing washers for best results.
Key Features
- Genuine Cummins OEM fuel return line grommet seal.
- Restores proper sealing on the VP44 return circuit.
- Prevents leaks, air intrusion, hard-start issues, and fuel odor.
- Direct-fit for 5.9L 24-valve Cummins engines (1998.5–2002).
- Durable material resists diesel exposure, heat, and vibration.
Fitment Details
This Cummins OEM grommet seal is used on VP44-equipped 24-valve engines:
- Engine: 5.9L Cummins ISB 24-Valve (VP44)
- Years: 1998.5–2002
- Vehicles: Dodge Ram 2500 & 3500
- Fuel System: VP44 return line sealing point
Always verify via engine serial number (ESN) before ordering.
Cross-Reference & Companion Cummins Parts
For a complete VP44 fuel system refresh, pair the 3905351 grommet with these genuine Cummins parts:
- CUMMINS 3944833 VP44 OEM FUEL INJECTION PUMP – factory replacement for 1998.5–2002.
- CUMMINS 3949698 FUEL RETURN BANJO WASHER – correct sealing washer for the return banjo.
- CUMMINS 3949699 FUEL BANJO BOLT SEAL – ensures leak-free connections.
- VIEW MORE GENUINE CUMMINS OEM PARTS
Common cross-reference numbers: 3905351, 3905351NX, 3905351RX. Always confirm by ESN.
Installation Notes
- Remove the old grommet carefully to avoid damaging the return port.
- Lightly lubricate the new grommet with clean diesel before installing.
- Inspect the return hose for cracking or swelling—replace if needed.
- After installation, run the engine and check for fuel seepage.
Specifications for cummins 3905351
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Part Number | 3905351 |
| Function | Fuel return line grommet seal for VP44 return circuit |
| Engine Compatibility | 5.9L Cummins ISB 24-Valve (1998.5–2002) |
| Vehicle Fitment | 1998.5–2002 Dodge Ram 2500/3500 |
| UPC | 193466034921 |
| GTIN | 193466034921 |
| Shipping Weight | 0.02 lb |
| Shipping Method | Standard ground shipping |
| E-Codes | Used on EPA transitional ISB platforms |
| Prop 65 Warning | WARNING: Diesel fuel and related residues can expose you to chemicals known to cause cancer and reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by batch) |
Frequently Asked Questions
WHAT DOES THE CUMMINS 3905351 GROMMET SEAL DO?
It seals the VP44 fuel return line to prevent fuel leaks and air entering the fuel system, which can cause hard starting.
DOES THIS FIT ALL 24-VALVE 5.9L CUMMINS ENGINES?
It fits most 1998.5–2002 24-valve VP44-equipped engines. Confirm via ESN for absolute accuracy.
WILL A DAMAGED GROMMET CAUSE PERFORMANCE ISSUES?
Yes. Air intrusion or return fuel leaks can cause poor idle, long cranking, surging, or VP44 fault codes.
IS THIS A GENUINE CUMMINS PART?
Yes—CPP Diesel supplies only 100% genuine Cummins OEM components for all Cummins-labeled listings.
SHOULD I REPLACE OTHER SEALS AT THE SAME TIME?
Yes—fuel system sealing washers and banjo seals wear similarly. Consider Cummins 3949698 and 3949699 during service.
