Product Description
Cummins 4988810 — #2 Cylinder High-Pressure Fuel Injection Line
MPN: 4988810 | Also Known As: injector fuel supply tube, fuel injection line (cyl #2) | Cross-Refs: Mopar 5086872AB
Why This Part
- ✓ OE formed steel line for a precise seal at the injector and fuel rail.
- ✓ Direct-fit for 2003–2007 Ram 5.9L ISB common-rail (cylinder #2).
- ✓ Restores proper high-pressure fuel delivery and prevents leaks.
- ✓ Genuine Cummins quality and corrosion-resistant finish.
Quick Specs
| Type | High-pressure injector fuel line (#2 cylinder) |
|---|---|
| OE Part # | 4988810 |
| Cross-Reference | Mopar 5086872AB (identification) |
| Qty Required | 1 per cylinder (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 before ordering.
Often Paired With
- Other cylinder lines: #1 (3957081), #3 (4988809), #4 (5289447), #5 (4988807), #6 (4988806)
- Fuel rail supply line: 3957079
- Inspect injector connector/tube seats; replace if damaged
What’s In The Box
- (1) Genuine Cummins Fuel Injection Line — Cylinder #2 (4988810)
Install Tips
- Start fittings by hand to avoid cross-threading; do not bend the line.
- Ensure seats are clean and free of debris; torque to factory spec per service manual.
- After install, prime the system and check for leaks at idle and under load.
FAQ
WILL THIS FIT MY 2003–2007 5.9L CUMMINS RAM?Yes—this is the OE high-pressure fuel line for the #2 cylinder on 2003–2007 5.9L ISB common-rail Ram 2500/3500 (confirm by VIN/ESN).
WHICH CYLINDER IS “#2”?This line services the #2 cylinder position. Order by cylinder as needed; matching part numbers for other cylinders are listed above.
CAN I REUSE AN OLD LINE?Reusing lines that are worn, deformed, or contaminated can lead to leaks. Best practice is to replace any suspect line and never force/bend it during installation.
WHAT’S THE TORQUE SPEC?Follow the Cummins factory service manual for torque values. Always start fittings by hand and recheck after initial run-in.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 4988810 with factory geometry and sealing interfaces.
