Product Description
Genuine Cummins
Cummins 4988809 — #3 Fuel Injection Line / Injector Fuel Supply Tube
MPN: 4988809 | Also Known As: injector fuel supply tube, high-pressure injection line | Cylinder: #3
Why This Part
- ✓ OE high-pressure line for precise rail-to-injector delivery on cylinder #3.
- ✓ Direct-fit for 2003–2007 Ram 5.9L ISB (common-rail).
- ✓ Restores reliability after cracks, leaks, or vibration fatigue.
- ✓ Genuine Cummins part for factory fit & sealing surfaces.
OE Fit Stock Replacement 1 Per Engine
Quick Specs
| Type | High-Pressure Fuel Injection Line / Injector Supply Tube |
|---|---|
| OE Part # | 4988809 |
| Cylinder | #3 |
| Qty Required | 1 per engine (sold individually) |
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.
Often Paired With
- Other cylinder lines (03–07 5.9L): #1 3957081, #2 4988810, #4 5289447, #5 4988807, #6 4988806
- Injector connector tube seals / washers (replace if disturbed)
- Fuel filter after any fuel-system service
What’s In The Box
- (1) Genuine Cummins Fuel Injection Line / Supply Tube — Cylinder #3 (4988809)
- Associated seals/hardware sold separately.
Install Tips
- Maintain absolute cleanliness; do not kink or pre-stress the line.
- Start fittings by hand to avoid cross-threading; torque to factory spec.
- Prime, then check for leaks with the engine running; re-check after heat cycle.
FAQ
WILL THIS FIT MY 2003–2007 5.9L CUMMINS RAM?Yes—this is the OE high-pressure line for cylinder #3 on 2003–2007 5.9L ISB common-rail trucks (verify by VIN/ESN).
WHAT CYLINDER IS 4988809?It’s specifically the #3 cylinder injection line (also called the injector fuel supply tube).
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 4988809 for proper fit, geometry, and sealing surfaces.
WHAT IF I NEED OTHER CYLINDERS?Common matches are #1 3957081, #2 4988810, #4 5289447, #5 4988807, and #6 4988806.
DO I NEED NEW SEALS?It’s best practice to replace connector tube seals/washers whenever lines are removed to ensure leak-free operation.
Product Videos
Custom Field
Vehicle Year 2003,2004,2005,2006,2007
Vehicle Make DODGE
ENGINE 5.9L
