Product Description
Cummins 5289447 — Fuel Injection Line #4 (High-Pressure, Rail to Injector)
MPN: 5289447 | Also Known As: injector fuel supply tube, high-pressure injector line | Cylinder: #4
Why This Part
- ✓ OE high-pressure line for accurate sealing and fuel delivery.
- ✓ Direct-fit for 2003–2007 Ram 5.9L ISB (common-rail).
- ✓ Updated design reduces vibration-related fatigue at the clamp.
- ✓ Cylinder-specific routing for #4 position.
Quick Specs
| Type | High-pressure fuel injection line (rail → injector) |
|---|---|
| OE Part # | 5289447 |
| Cylinder | #4 only (use matching lines for cylinders #1–3 & #5–6) |
| Qty Required | 1 per engine (position-specific) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 2003–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
Industrial/Off-Highway: Used primarily on Tier 3 ISB/QSB 5.9 applications—verify by ESN before ordering.
Often Paired With
- Companion Lines (’03–’07 5.9L): #1 3957081, #2 4988810, #3 4988809, #5 4988807, #6 4988806
- Line clamp/hardware if original is worn or missing
- Clean fuel system service after contamination
What’s In The Box
- (1) Genuine Cummins Fuel Injection Line #4 (5289447)
- Clamps/hardware sold separately
Install Tips
- Relieve rail pressure; work ultra-clean to protect injectors.
- Start fittings by hand to avoid cross-threading; do not bend the line.
- Tighten to factory torque; recheck for leaks after warm-up.
FAQ
WILL THIS FIT MY 2003–2007 5.9L CUMMINS RAM?Yes—this OE high-pressure line fits 2003–2007 Ram 2500/3500 with the 5.9L ISB common-rail (verify by VIN/ESN).
WHICH CYLINDER DOES 5289447 FIT?It’s the position-specific line for cylinder #4. Use the matching part numbers for cylinders #1–3 and #5–6.
IS THIS THE SAME AS A “CONNECTOR TUBE”?Retailers sometimes call it a fuel supply tube, but this is the external high-pressure line from the rail to the injector for #4.
DOES THIS INCLUDE CLAMPS OR HARDWARE?No—re-use serviceable clamps or replace if worn. Ensure the clamp is tight to prevent vibration-induced fatigue.
WILL THIS FIT 6.7L TRUCKS?No—6.7L ISB uses different line part numbers. This listing is specific to 5.9L (’03–’07).
