CUMMINS 5289447 OEM FUEL INJECTION LINE #4 – RAM 5.9L (2003–2007)

The genuine Cummins 5289447 OEM fuel injection line #4 is the factory high-pressure injector fuel supply tube that connects the rail to the #4 injector on 2003–2007 Ram 2500/3500 trucks with the 5.9L ISB common-rail engine. This precision-formed line restores OE geometry, sealing surfaces, and flow so your 5.9 Cummins maintains the smooth idle, clean power, and reliability you expect from genuine Cummins fuel system parts.

Over time, original lines can crack, rust, or leak from vibration and extreme under-hood temperatures. Replacing your #4 line with a new genuine Cummins 5289447 prevents rail-pressure loss, hard starts, and fuel mist around the injector, while matching the routing and fitment designed by Cummins for the 5.9L ISB platform.

Why Choose Genuine Cummins 5289447?

• OE-formed high-pressure tube for cylinder #4 on 5.9L ISB (common-rail) engines.
• Correct rail-to-injector routing for proper clearance and clamp engagement.
• Hardened tube ends and precise flare seats for leak-free sealing under rail pressure.
• Direct replacement for worn, cracked, or corroded factory fuel injection lines.
• Compatible with stock and performance tunes when installed per Cummins specs.

Verified Fitment

Automotive:

• 2003–2007 Dodge Ram 2500 5.9L ISB (24V common-rail)
• 2003–2007 Dodge Ram 3500 5.9L ISB (24V common-rail)

Engine Platform: Cummins 5.9L ISB common-rail, also used on Tier 3 ISB/QSB 5.9 applications where 5289447 is specified (verify by ESN before ordering).

Function & Installation Notes

This line carries high-pressure fuel from the common rail to the #4 injector. Any restriction, bend, or leak in the tube can cause rough running, high injector return, or low rail pressure codes. Always work in a spotless environment, protect open fittings from debris, and torque fittings to factory specification from the Cummins or Dodge service manual.

• Start tube nuts by hand to avoid cross-threading.
• Never bend, twist, or “tweak” the tube to make it fit – replace if damaged.
• Follow the factory routing and reuse OE clamps/retainers or replace if corroded.
• After installation, prime the system, start the engine, and check for leaks at idle and under load.

Cross-Reference Cummins Companions (Same Engine Family)

Build a complete OE line set for your 5.9L ISB by pairing 5289447 with the matching genuine Cummins rail-to-injector lines for the other cylinders, all available from CPP Diesel:

• #1 Cylinder – Cummins 3957081 OEM #1 Fuel Injection Line
• #2 Cylinder – Cummins 4988810 OEM #2 Fuel Injection Line
• #3 Cylinder – Cummins 4988809 OEM #3 Fuel Injection Line
• #5 Cylinder – Cummins 4988807 OEM #5 Fuel Injection Line
• #6 Cylinder – Cummins 4988806 OEM Injector Fuel Supply Tube (#6)

What's In The Box

• (1) Genuine Cummins 5289447 injector fuel supply tube / fuel injection line (#4)
• Clamps/retainers are reused or replaced separately as needed.

FAQ

Yes. Cummins 5289447 is the OE high-pressure fuel injection line for cylinder #4 on 2003–2007 Ram 2500/3500 trucks equipped with the 5.9L ISB common-rail engine. Always confirm fitment by VIN or engine serial number if you are unsure.

This tube routes high-pressure fuel from the common rail to the #4 injector. It must maintain precise geometry and sealing to keep rail pressure stable, avoid leaks, and ensure consistent fuel delivery to the cylinder.

It is not mandatory, but it is highly recommended if your truck has corrosion, has seen repeated injector work, or has experienced vibration damage. Many owners replace cylinders #1–#6 together using genuine Cummins lines to reset the entire high-pressure distribution system.

No. High-pressure common-rail lines are engineered with specific bend radii and are not intended to be reshaped. Bending or straightening can crack the tube or distort the sealing surfaces. If the line is damaged or misrouted, replace it.

This is a genuine Cummins 5289447 injector fuel supply tube. Using OE lines ensures correct geometry, material quality, and long-term durability compared to generic substitutes.

Like many metal automotive components, this product may be subject to California Proposition 65 warnings for chemicals including those that can cause cancer or reproductive harm. For more information see the official California Prop 65 resources (www.P65Warnings.ca.gov).

Specifications for cummins 5289447