Product Description
CUMMINS 4988806 OEM INJECTOR FUEL SUPPLY TUBE (#6) is the genuine high-pressure fuel injection line that feeds cylinder #6 on 2003–2007 Dodge Ram 2500/3500 trucks equipped with the 5.9L Cummins ISB common-rail engine. This direct-fit tube is engineered by Cummins to maintain precise fuel delivery, sealing, and durability under extreme vibration and high-pressure operating conditions.
Key Features
- Genuine Cummins 4988806 high-pressure injector fuel supply tube for cylinder #6.
- Direct-fit replacement for 2003–2007 Ram 2500/3500 5.9L ISB common-rail engines.
- Precision-bent steel tubing resists fatigue, cracking, and high-pressure leaks.
- Factory-style flare and seat geometry for proper sealing at rail and injector.
- Engineered to OE specifications for long service life and consistent performance.
Fitment
- Engine: Cummins ISB 5.9L 24V, common-rail
- Truck: Dodge Ram 2500 & 3500
- Model Years: 2003, 2004, 2005, 2006, 2007
- Position: Cylinder #6 high-pressure injector fuel supply tube
- Industrial/Off-Highway: Also used on select Tier 3 ISB/QSB 5.9L applications – confirm by ESN before ordering.
Cross-Reference & ID Numbers
- Cummins OE: 4988806 (primary), 3957146 (ID only)
- Mopar: 5086876AA, 5086876AB, 5086876AC, 5086876AD
- Aftermarket Reference: Dorman 904-327, PAI 180336
Related Cummins Components on CPP Diesel
Refresh the entire common-rail feed system on your 5.9L Cummins using other genuine Cummins parts available at CPP Diesel:
- CUMMINS 3957081 OEM #1 FUEL INJECTION LINE / INJECTOR FUEL SUPPLY TUBE – RAM 5.9L (2003–2007)
- CUMMINS 4988809 OEM #3 FUEL INJECTION LINE (INJECTOR FUEL SUPPLY TUBE) – RAM 5.9L (2003–2007)
- CUMMINS 5264181 OEM INJECTOR FUEL SUPPLY CONNECTOR RETAINER (CONNECTOR TUBE NUT) – RAM 5.9L (2003–2007)
- CUMMINS 3957079 OEM FUEL RAIL SUPPLY LINE (CP3 TO RAIL) – RAM 5.9L (2003–2007)
- CUMMINS 3957290 OEM INJECTOR RETURN CHECK VALVE – RAM 5.9L (2003–2007)
What’s Included
- (1) Genuine Cummins injector fuel supply tube / fuel injection line – cylinder #6 (PN 4988806)
- Existing clamps and brackets are normally reused; inspect and replace if damaged or corroded.
Installation Notes
- Always work with extremely clean fuel system components; cap all open lines and ports.
- Route the line exactly like the original to avoid preload and vibration-induced fatigue.
- Do not bend, kink, or re-form the tube; replace if damaged.
- Tighten fittings to OEM torque specifications and recheck for leaks after initial run-in.
Specifications for cummins 4988806
| Brand | Cummins Genuine Parts |
| Part Number | 4988806 |
| Alternate IDs / Cross Reference | Cummins 3957146; Mopar 5086876AA / 5086876AB / 5086876AC / 5086876AD; Dorman 904-327; PAI 180336 |
| Engine Application | Cummins ISB 5.9L 24V common-rail; select ISB/QSB 5.9L industrial applications (verify by ESN) |
| Position | Cylinder #6 high-pressure injector fuel supply tube |
| UPC | 193807146153 |
| GTIN | 193807146153 |
| Shipping Weight | Approx. 0.36 lb (0.16 kg) |
| Package Dimensions (W x H x L) | 0.60 in x 0.63 in x 8.40 in (approximate product carton size) |
| Shipping Method | Standard ground – ships from CPP Diesel; calculated at checkout |
| Material | High-strength steel tube with precision-formed ends |
| E-Codes / Emissions | Not an emissions control device; E-codes not applicable |
| Prop 65 | No California Proposition 65 warning listed by common distributors; always follow local regulations. |
FAQ
WILL THIS FIT MY 2003–2007 5.9L CUMMINS RAM?
Yes. Cummins 4988806 is the OE high-pressure injector fuel supply tube for cylinder #6 on 2003–2007 Dodge Ram 2500/3500 trucks equipped with the 5.9L ISB common-rail engine. For best accuracy, confirm by VIN or engine serial number (ESN).
WHAT CYLINDER IS THIS LINE FOR?
This part is specifically for cylinder #6. Lines for cylinders #1–#5 are sold separately and are also available on CPP Diesel as genuine Cummins parts.
IS THIS A HIGH-PRESSURE COMMON-RAIL LINE?
Yes. This tube carries high-pressure fuel from the common rail to the injector. Because of the extreme pressures involved, never reuse a damaged line and always keep the sealing surfaces and ports perfectly clean.
IS THIS A GENUINE CUMMINS PART OR AFTERMARKET?
This is a genuine Cummins part number 4988806 sourced through CPP Diesel. Choosing OE helps ensure correct fitment, long-term durability, and consistent injector performance.
WHEN SHOULD I REPLACE THIS INJECTOR FUEL SUPPLY TUBE?
Replace the line anytime it is cracked, kinked, leaking, shows evidence of chafing, or when you are replacing a damaged injector at cylinder #6. Many technicians replace all six lines on higher-mileage common-rail engines to prevent future leaks.
DO I NEED ANY OTHER PARTS WHEN INSTALLING THIS LINE?
Inspect the connector tube nut and injector connector for wear. It is common to pair this line with new connector hardware and to refresh other injector lines, the CP3-to-rail supply line, and the injector return check valve while the system is open.
