Keep your 3rd‑gen common‑rail Cummins properly fed with the Alliant Power AP4089602 Fuel Transfer Pump Kit. This direct‑fit fuel supply pump is designed for 2003–2004 Dodge Ram 2500/3500 5.9L ISB trucks with common‑rail injection, restoring reliable low‑pressure fuel delivery and helping protect injectors and high‑pressure components from starvation.
Direct‑fit fuel transfer (lift) pump kit for 2003–2004 Dodge Ram 5.9L Cummins ISB common rail.
Engineered as a stock‑style replacement for factory low‑pressure fuel supply.
Listed OEM cross‑reference includes 3969705 hose.
New Alliant Power unit
Ideal for stock and lightly modified 3rd‑gen Cummins fuel systems.
The AP4089602 kit is targeted specifically at early 3rd‑gen 5.9L Cummins trucks that rely on a dedicated low‑pressure transfer pump to feed the common‑rail injection system. Over time, the original pump can weaken and fail, causing low supply pressure, hard starts, and potential injector or pump damage. This Alliant Power kit provides an OE‑style solution sized for factory fuel demand and typical towing/working use, making it a smart replacement when diagnosing low‑pressure issues or refreshing an aging fuel system. The included hose cross‑reference (3969705) helps match the kit to the correct plumbing configuration on 2003–2004 Rams.
2003–2004 Dodge Ram 2500 5.9L Cummins ISB with common‑rail injection.
2003–2004 Dodge Ram 3500 5.9L Cummins ISB with common‑rail injection.
Application note: Listed specifically as “with Common Rail”; not for earlier VP44 trucks.
Reliable low‑pressure fuel delivery to protect injectors and the high‑pressure pump.
Restores proper fuel supply on trucks with weak or failing factory lift pumps.
OE‑style fitment reduces installation time and avoids custom plumbing.
Strong choice for work, tow, and daily‑driver 5.9L Cummins trucks needing stock‑style dependability.
Typical signs that a 2003–2004 5.9L common‑rail truck may need the AP4089602 kit include:
Hard starting, extended cranking, or occasional no‑start, especially after sitting.
Loss of power or stumbling under load or at higher RPM.
Surging, hesitation, or cutting out as rail demand increases.
Abnormal noise from the high‑pressure pump due to low inlet supply (often more pronounced under load).
Addressing low‑pressure issues with a fresh transfer pump is a common step before condemning high‑dollar injection components.
AP4089602 is sold as a new Alliant Power fuel transfer pump kit and is covered by Alliant’s 2 year limited warranty against defects in materials and workmanship.
Q: What trucks does AP4089602 fit?
A: It fits 2003–2004 Dodge Ram 2500/3500 5.9L Cummins ISB engines equipped with common‑rail injection, as listed in the fitment table.
Q: Is this a complete kit or just the pump?
A: It is listed as a fuel transfer pump kit and includes at least the pump and a hose that cross‑references OEM 3969705; exact contents should be confirmed on the product page images and description.
Q: Will this work on VP44‑equipped 5.9L trucks?
A: No, the AP4089602 kit is specified for common‑rail ISB applications only; VP44 trucks use different transfer pump kits such as AP4943048.
Q: Do I need tuning or other modifications after installing this pump?
A: No tuning is typically required for a stock‑style transfer pump replacement; it is designed to restore OE‑equivalent supply pressure and flow.
Q: Is this a genuine Alliant Power part?
A: Yes, AP4089602 is a new Alliant Power fuel transfer pump kit, sold under the Alliant brand with listed availability and condition as new.
This product fits the following vehicle configurations:
| YEARS | VEHICLE MFG | ENGINE MFG | ENGINE | APPLICATION | NOTES | FOOTNOTESE | NGINE SERIAL NUNMBER(S) | OEM CROSS-REFERENCE |
|---|---|---|---|---|---|---|---|---|
| 2003-2004 | Dodge | Cummins | ISB | with Common Rail | N/A | 3969705 (Hose) |
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