Product Description
CUMMINS 3934396 OEM VACUUM PUMP OIL SUPPLY LINE – RAM 5.9L (1998.5–2002)
The genuine CUMMINS 3934396 OEM vacuum pump oil supply line provides the critical lubrication feed from the engine block to the vacuum pump on 1998.5–2002 5.9L Cummins ISB engines. A leaking or restricted line can quickly damage the vacuum pump, cause front-engine oil messes, and reduce braking/ HVAC vacuum performance. This authentic Cummins hose ensures proper oil delivery, correct routing, and factory-grade durability.
This OE line is engineered to withstand heat, vibration, and constant oil pressure found on 24-valve ISB platforms. If your vacuum pump is being rebuilt or replaced, Cummins strongly recommends replacing the feed line at the same time. Match it with other genuine Cummins components such as the CUMMINS 3937736 vacuum pump seal kit to fully eliminate oil leaks.
Key Features
- Genuine Cummins OEM vacuum pump oil supply line.
- Direct-fit for 1998.5–2002 5.9L ISB 24-valve engines.
- Restores proper vacuum pump lubrication and prevents pump failure.
- High-temperature, oil-rated, vibration-resistant construction.
- Ideal when replacing or servicing the vacuum pump assembly.
Fitment Details
- Engine: Cummins 5.9L ISB 24-Valve
- Model Years: 1998.5–2002
- Vehicle: Dodge Ram 2500 / 3500 with 5.9L Cummins
- Function: Supplies lubricating engine oil to the vacuum pump
Always confirm fitment by VIN/ESN to ensure correct routing and connector type.
Cross-Reference & Related Cummins Parts
- CUMMINS 3937736 OEM VACUUM PUMP SEAL KIT – 5.9L
- CUMMINS 3925958 OEM VACUUM PUMP GASKET – 5.9L
- CUMMINS 3947898 OEM VACUUM PUMP ASSEMBLY – 5.9L
Cross-reference numbers: 3934396, 3934396RX, 3918151 (verify by ESN for supersessions).
Installation Notes
- Replace the line any time the vacuum pump is serviced or replaced.
- Verify both sealing surfaces are clean before tightening.
- Prime the oil system and check for leaks after startup.
Specifications for cummins 3934396
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3934396 |
| Alternate / Superseded Numbers | 3934396RX, 3918151 (verify per ESN) |
| Function | Engine oil supply line feeding the vacuum pump |
| Engine Compatibility | 5.9L ISB 24-Valve (1998.5–2002) |
| Vehicle Fitment | 1998.5–2002 Ram 2500/3500 with 5.9L Cummins |
| UPC | 190861141980 |
| GTIN | 190861141980 |
| Shipping Weight | Approx. 0.25 lb |
| Shipping Method | Standard ground; expedited options available |
| E-Codes | Used on ISB 5.9 emissions families; confirm per ESN |
| Prop 65 | WARNING: May expose you to chemicals including engine oil residue known to cause cancer and reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by lot) |
Frequently Asked Questions
WILL THIS FIT MY 1998.5–2002 5.9L CUMMINS?
Yes — CUMMINS 3934396 is the correct oil supply line for most ISB 24-valve engines in this year range. Always confirm by VIN/ESN.
SHOULD I REPLACE THIS WHEN INSTALLING A NEW VACUUM PUMP?
Yes. Cummins recommends replacing the oil supply line to prevent contamination, leaks, or collapse that can starve the pump of oil.
WHAT OTHER PARTS SHOULD I REPLACE?
Common companion parts include the CUMMINS 3937736 seal kit and CUMMINS 3925958 gasket.
IS THIS A GENUINE CUMMINS PART?
Yes — CPP Diesel sells only authentic Cummins OEM components in the Cummins Genuine Parts line.
