Product Description
Genuine Cummins
Cummins 3923090 — Fuel Supply Line to Fuel Pre-Heater (5.9L 12V)
MPN: 3923090 | Also Known As: fuel supply tube, fuel feed line, pre-heater feed line
Why This Part
- ✓ OE line for the fuel feed to the pre-heater on 12-valve 5.9L.
- ✓ Direct-fit for 1994–1998 Ram 2500/3500 5.9L 12V (P-pump).
- ✓ Restores factory fuel routing & sealing after age or damage.
- ✓ Built to Cummins specs for durability and proper flow.
OE Fit Stock Replacement 1 Per Engine
Quick Specs
| Type | Fuel supply line / tube to pre-heater |
|---|---|
| OE Part # | 3923090 |
| Qty Required | 1 per engine (sold individually) |
| Notes | Matches OE bends/length for proper fit and clamp points |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | Ram 5.9L 12-Valve (6BT, P-pump) | Ram 2500/3500 |
Industrial/Off-Highway: Used primarily on Tier 1 5.9L B-series applications—verify by ESN.
Often Paired With
- Fuel pre-heater assembly and mounting hardware
- Correct ID fuel hose segments & quality clamps
- Fresh fuel filter after service
What’s In The Box
- (1) Genuine Cummins Fuel Supply Line / Tube (3923090)
- Clamps, hoses, and hardware sold separately
Install Tips
- Match routing to factory path; avoid kinks or abrasion points.
- Use new clamps; pressure test and check for seepage at warm-up.
- Prime system to reduce crank time after service.
FAQ
WILL THIS FIT MY 1994–1998 12-VALVE CUMMINS RAM?Yes—this OE line feeds the fuel pre-heater on ’94–’98 5.9L 12V Ram 2500/3500 (verify by VIN/ESN).
WHAT DOES THIS LINE CONNECT?It’s the supply line that routes fuel to the pre-heater per OE path for the 12-valve system.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3923090 built to factory geometry and flow requirements.
DO I NEED EXTRA PARTS TO INSTALL?You may need fresh hose segments and clamps, and it’s smart to replace the fuel filter after opening the system.
DOES THIS FIT 1998.5–2002 OR 2003+ TRUCKS?No—those platforms use different lines. This listing targets the 12-valve 5.9L (’94–’98).
