Product Description
CUMMINS 4988807 OEM FUEL INJECTION LINE (#5) – RAM 5.9L (2003–2007)
Restore safe, leak-free high-pressure fuel delivery on your 5.9L Cummins with the genuine Cummins 4988807 fuel injection line for cylinder #5. This is the same OE high-pressure rail-to-injector tube used by Cummins on 2003–2007 Ram 2500/3500 trucks with the 5.9L ISB common-rail engine, built to handle the heat, vibration, and pressure of daily work, towing, and performance use.
Each tube is precision-formed steel with factory-correct bends, flare geometry, and tube nuts so it routes cleanly from the common rail to injector #5 without stress or kinking. Using the proper OEM Cummins injector fuel supply tube helps maintain rail pressure, prevent fuel leaks, and protect expensive injectors from damage caused by poor sealing or contamination.
Beyond pickup applications, Cummins lists part number 4988807 for Tier 3 ISB/QSB 5.9L engines in industrial and marine service. That makes this line a smart choice when you need the correct tube for engine swaps, generator sets, or other equipment using the 5.9L ISB/QSB platform (always confirm by ESN for non-automotive engines).
Features & Benefits
- Genuine Cummins 4988807 high-pressure fuel injection line for cylinder #5.
- Direct-fit replacement for 2003–2007 Ram 2500/3500 with 5.9L ISB common-rail (24V).
- Correct OE tube ends and flare geometry for reliable sealing at the rail and injector.
- Precision-bent steel construction to resist vibration fatigue and cracking.
- Compatible with many Tier 3 ISB/QSB 5.9L industrial and marine engines (verify by ESN).
- Ideal when replacing a leaking, rusted, or previously removed #5 injector line.
Fitment
- Engine: 5.9L Cummins ISB (24-valve common-rail)
- Automotive Chassis: 2003, 2004, 2005, 2006, 2007 Dodge Ram 2500/3500
- Position: High-pressure line from common rail to injector “Cylinder #5”
- Industrial / Marine: Selected Tier 3 ISB/QSB 5.9L applications (confirm via Cummins ESN before ordering).
Note: Cylinder numbers on the 5.9L inline-6 are counted from front (gear train) to rear. Cylinder #5 is the second from the rear. Always confirm routing with a Cummins or Ram factory service manual.
Cross-Reference & Companion Cummins Lines (Ram 5.9L 2003–2007)
Refresh the entire set of high-pressure lines with matching genuine Cummins parts from CPP Diesel:
- CUMMINS 3957081 #1 Fuel Injection Line – Rail-to-injector line for cylinder #1.
- CUMMINS 4988810 #2 Fuel Injection Line – High-pressure line for cylinder #2.
- CUMMINS 4988809 #3 Fuel Injection Line – Injector supply tube for cylinder #3.
- CUMMINS 5289447 #4 Fuel Injection Line – High-pressure line for cylinder #4.
- CUMMINS 4988806 #6 Injector Fuel Supply Tube – High-pressure line for cylinder #6.
Common cross-reference ID numbers for Cummins 4988807 include Cummins 3957085 and Mopar 5086875AA, 5086875AB, and 904-326 (identification only; always order by Cummins P/N 4988807).
Installation Notes
- Work absolutely clean—cap open rail and injector ports to keep debris out of the fuel system.
- Route the tube exactly like the factory line; do not bend, twist, or pre-load the tube.
- Start tube nuts by hand to prevent cross-threading, then torque to the factory specification from the Cummins/Ram service manual.
- After installation, prime the fuel system, start the engine, and check carefully for leaks at idle and under load.
FAQ
Will this fit my 2003–2007 5.9L Cummins Ram?
Yes. Cummins 4988807 is the genuine OE high-pressure fuel injection line for cylinder #5 on 2003–2007 Dodge Ram 2500/3500 trucks equipped with the 5.9L ISB common-rail engine. Always verify fitment by VIN or engine serial number if components have been changed.
Is this the rail-to-injector line or the connector tube?
This part is the external high-pressure line that runs from the common rail to the injector on cylinder #5. The connector (feed) tube and its sealing washers are separate components.
Should I replace other injector lines at the same time?
If one high-pressure line has cracked or started leaking, the others may not be far behind. Many shops replace all six Cummins lines (#1–#6) together to reduce downtime and ensure consistent sealing and routing.
Can I reuse an old high-pressure injector line?
Reusing a high-pressure line is not recommended. Lines can work-harden, deform at the sealing cones, or develop micro-cracks from vibration. For best results and safety, replace any removed or damaged line with a new OEM Cummins tube.
Does this part carry a Prop 65 warning?
Yes. Like many diesel fuel system components, this product is associated with a California Proposition 65 warning for cancer and reproductive harm.
Specifications for cummins 4988807
| Parameter | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 4988807 (Injector Fuel Supply Tube / Fuel Injection Line #5) |
| UPC | 193807146146 |
| GTIN | 193807146146 |
| Cross Reference | Cummins 3957085; Mopar 5086875AA, 5086875AB, 904-326; PAI 180335 (reference only) |
| E-codes | Not applicable |
| Engine Applications | 5.9L ISB/QSB, primarily Tier 3; 2003–2007 Ram 2500/3500 5.9L ISB common-rail (cylinder #5) |
| Material | Formed steel high-pressure fuel line with OE tube nuts |
| Shipping Info | Approx. ship weight 0.58 lb; typically ships via standard ground service within 1–5 business days (domestic U.S.). |
| Country of Origin | As supplied by Cummins (contact CPP Diesel for current origin details) |
| Prop 65 | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
