Product Description
Keep your 5.9L Cummins running leak-free with the CUMMINS 4988810 OEM #2 FUEL INJECTION LINE, the genuine high-pressure rail-to-injector tube for cylinder #2 on 2003–2007 Dodge Ram 2500/3500 trucks with the 5.9L ISB common-rail diesel. This line restores factory fuel delivery, sealing, and reliability with the exact geometry, flare angles, and fittings Cummins engineered for your engine.
Over time, factory lines can crack, corrode, or lose clamping force from vibration and thermal cycling, leading to hard-start issues, fuel leaks, and rail pressure loss. Upgrading to a new genuine Cummins 4988810 tube ensures proper injector feed, prevents aeration, and protects your high-dollar injectors and rail from damage. If you’re chasing rough idle, fuel odor under the hood, or visible wetness near cylinder #2, this is the OE fix.
DIRECT-FIT GENUINE CUMMINS REPLACEMENT
- Genuine Cummins OEM #2 high-pressure fuel injection line – not a generic import.
- Correct length, bends, and flare angles for 2003–2007 5.9L ISB common-rail engines.
- Precision-machined sealing cones for proper rail and injector interface.
- Engineered to handle factory rail pressures and vibration without fatigue cracking.
- Ideal when replacing injectors or chasing repeat fuel leaks at cylinder #2.
FITMENT DETAILS
- Engine: Cummins ISB 5.9L common-rail (24-valve)
- Truck: 2003, 2004, 2004.5, 2005, 2006, 2007 Dodge Ram 2500 & 3500
- Cylinder: #2 rail-to-injector high-pressure line
- Configuration: High-pressure common-rail fuel system
- Other Uses: Tier 3 5.9L ISB/QSB industrial applications where 4988810 is specified
CROSS-REFERENCE & RELATED PART NUMBERS
- Cummins: 4988810 (injector fuel supply tube, #2)
- Mopar/Chrysler: 5086872AB (OE dealer fuel line for cylinder #2)
- Additional Cross Reference: 3957082 (aftermarket/industrial cross reference)
COMPANION CUMMINS FUEL LINES AT CPP DIESEL
Refresh the entire high-pressure set on your 5.9L by pairing 4988810 with the matching genuine Cummins lines for the other cylinders, all available from CPP Diesel:
- #1 Cylinder Line – CUMMINS 3957081 OEM #1 FUEL INJECTION LINE – RAM 5.9L (2003–2007)
- #3 Cylinder Line – CUMMINS 4988809 OEM #3 FUEL INJECTION LINE – RAM 5.9L (2003–2007)
- #4 Cylinder Line – CUMMINS 5289447 OEM #4 FUEL INJECTION LINE – RAM 5.9L (2003–2007)
- #5 Cylinder Line – CUMMINS 4988807 OEM #5 FUEL INJECTION LINE – RAM 5.9L (2003–2007)
- #6 Cylinder Line – CUMMINS 4988806 OEM #6 INJECTOR FUEL SUPPLY TUBE – RAM 5.9L (2003–2007)
WHY BUY YOUR CUMMINS 4988810 FROM CPP DIESEL?
- Only genuine Cummins OEM parts – no mystery knock-offs.
- Specialized in Dodge Ram Cummins platforms from 1989–present.
- Real-world diesel tech support from enthusiasts who build and drive these trucks.
- Fast, trackable shipping to get you back on the road quickly.
Specifications for cummins 4988810
| Brand | Cummins Genuine Parts |
|---|---|
| Part Number | 4988810 |
| UPC (Barcode) | 193807146108 |
| GTIN | 193807146108 |
| Engine Compatibility | 5.9L Cummins ISB / QSB common-rail diesel |
| Vehicle Fitment | 2003–2007 Dodge Ram 2500/3500 with 5.9L ISB, cylinder #2 |
| Cross Reference | Mopar 5086872AB, Cummins 3957082 (reference only – verify applications) |
| E-Codes | Not specified |
| Shipping Weight | Approx. 0.4 lb (billed weight) |
| Shipping Info | Ships from CPP Diesel via standard ground; expedited options available at checkout |
| Prop 65 | No California Proposition 65 warning listed for this part |
FAQ – CUMMINS 4988810 #2 FUEL INJECTION LINE
What vehicles does the Cummins 4988810 line fit?
This line is the genuine Cummins #2 high-pressure rail-to-injector tube for 2003–2007 Dodge Ram 2500 and 3500 trucks equipped with the 5.9L ISB common-rail diesel. It also appears on some Tier 3 ISB/QSB 5.9 industrial applications where 4988810 is the specified part number.
Should I replace all six injector lines at the same time?
It’s not required, but it’s strongly recommended if the truck has high mileage or multiple cylinders showing signs of leakage or cracking. Replacing all six lines at once helps ensure even clamp load, consistent sealing, and reduces the chance of another line failing shortly after you repair cylinder #2.
Do I need to follow a specific torque and installation procedure?
Yes. Always clean the sealing surfaces, align the line carefully in the clamps, and torque the rail and injector nuts to the values specified in the Cummins or Dodge service manual. Over- or under-torquing can damage the flares or cause leaks. If you’re unsure, consult factory documentation or a qualified diesel technician.
Is this a genuine Cummins part or an aftermarket replacement?
This is a genuine Cummins OEM fuel injection line, sourced through CPP Diesel as an authorized Cummins parts retailer. You receive the real Cummins 4988810 tube with correct markings, materials, and quality control – not a generic or off-brand alternative.
What other parts should I consider when installing this line?
Whenever you open the high-pressure system, it’s smart to inspect or replace injector connector tubes, sealing washers, line clamps, and any rubber return hoses that look aged. If your truck has significant mileage, consider replacing all six Cummins OEM injector lines along with this 4988810 tube for a complete, worry-free refresh.
