Product Description
The Cummins 3923090 OEM Fuel Supply Line is the genuine fuel line that delivers low-pressure diesel from the fuel filter or inlet circuit directly to the factory fuel pre-heater on 1994–1998 Dodge Ram 2500/3500 trucks equipped with the 5.9L 12-Valve Cummins (6BT). This OE-formed line is engineered for proper routing, vibration resistance, and leak-free operation—preserving reliable cold-weather starting and stable fuel temperature management.
Unlike universal rubber hose replacements, the OEM Cummins 3923090 hard line maintains correct diameter, bend geometry, and durability for long-term performance. It is the ideal replacement when restoring the factory fuel system or fixing leaks caused by corrosion, abrasion, or age-related wear.
Fitment
- 1994–1998 Dodge Ram 2500 with 5.9L 12-Valve Cummins (6BT)
- 1994–1998 Dodge Ram 3500 with 5.9L 12-Valve Cummins (6BT)
- Connects fuel supply to OEM pre-heater assembly (cold-start fuel warming circuit)
Cross-Reference (Cummins-Only)
Related Cummins components for the 5.9L 12-Valve fuel system:
• Cummins 3903924 Timing Pin – 12-Valve
• Cummins 3909395 Spring Hose Clamp – Dipstick
• Cummins 3900267 Tappet Cover Bolt Grommet Seal
FAQ
What does the Cummins 3923090 fuel supply line do?
This line delivers low-pressure diesel from the supply side to the OEM fuel pre-heater, supporting fuel warm-up for improved cold-start performance.
Is this line for the 12-Valve or 24-Valve Cummins?
This part fits only the 1994–1998 5.9L 12-Valve Cummins (6BT). The 24-Valve ISB uses different routing and components.
Can I replace this line with rubber hose?
Using generic hose is not recommended. The OEM steel line resists abrasion, pressure variation, and vibration far better and ensures correct flow restriction and routing.
Does this line come with clamps or fittings?
No. The line only is included. Reuse your OEM fittings or replace them if damaged.
Specifications for cummins 3923090
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 3923090 |
| Component Type | Fuel Supply Line (to Fuel Pre-Heater) |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Used on OEM fuel heater/supply assemblies 1994–1998 12-Valve Cummins |
| E-Codes | N/A |
| Shipping Weight | 0.30 lbs |
| Package Dimensions | Varies by bend profile |
| Prop 65 Warning | Not Applicable |
