This is the Alliant Power AP55102, an XPI common-rail fuel injector for the Cummins ISX15, remanufactured by Alliant Power. Catalogs list it for ISX15 and QSX15 engines built to EPA10. It replaces Cummins 5579415 and 2894920, including the Cummins exchange numbers 5579415PX, 5579415RX, 5579415NX, 2894920PX, 2894920RX and 2894920NX. A refundable core applies. The engine takes six, and this listing is for one injector.

Cummins used several XPI injectors on the 15 liter engine and they are sold by Cummins number. Two of them are listed for EPA10 engines: AP55102 (Cummins 5579415 and 2894920) and AP55101 (Cummins 5579417 and 2872405). Catalogs keep the two apart, so the emissions year alone will not tell you which one your engine takes. Later engines take AP55100 (Cummins 5579419 and 2897320, EPA13) or AP55128 (Cummins 5579421, EPA17 and later). The usual reasons to replace one are hard starting, a rough idle, a miss, smoke, low power or an injector fault code. Dirty fuel is what wears XPI injectors, so fit new fuel filters at the same time.

Specifications

Fits / Applications

• Cummins ISX15 with the XPI common-rail fuel system, built to EPA10, on engines that call for injector 5579415 or 2894920
• Cummins QSX15 engines that use the same Cummins injector (confirm by CPL)
• Replaces Cummins 5579415, 5579415PX, 5579415RX, 5579415NX, 2894920, 2894920PX, 2894920RX and 2894920NX
• Not for engines that call for Cummins 5579417 or 2872405 (AP55101, also EPA10), 5579419 or 2897320 (AP55100, EPA13), or 5579421 (AP55128, EPA17 and later)
• Not for the ISX12. The 12 liter engine uses its own XPI injectors.
• Six injectors per engine. This listing is for one injector.

Alliant Power’s install bulletin for its Cummins ISX injectors gives the steps: clean the injector bore, oil the injector O-ring with clean engine oil, fit a new injector feed tube, then tighten the hold-down bolt and the feed tube nut in stages to the Cummins specification. Keep the injector harness clear of the rocker levers and the engine brake housing. Each injector carries its own trim code on the label, and the code is entered with a scan tool once the injector is in. Change the fuel filters at the same time, because dirty fuel is the main thing that wears XPI injectors.

Part Numbers & Cross Reference

Alliant Power AP55102  ·  Cummins 5579415  ·  Cummins 5579415PX  ·  Cummins 5579415RX  ·  Cummins 5579415NX  ·  Cummins 2894920  ·  Cummins 2894920PX  ·  Cummins 2894920RX  ·  Cummins 2894920NX  ·  Interstate-McBee R-5579415  ·  Interstate-McBee R-2894920

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

What Cummins numbers does the AP55102 replace?

Cummins 5579415 and 2894920, including the exchange numbers 5579415PX, 5579415RX, 5579415NX, 2894920PX, 2894920RX and 2894920NX.

What is the difference between AP55102 and AP55101?

Both are Alliant Power remanufactured XPI injectors listed for EPA10 ISX15 engines, but they replace different Cummins injectors. AP55102 replaces 5579415 and 2894920. AP55101 replaces 5579417 and 2872405. Order by the number on your old injector, or call 530-668-0818 with your engine serial number and CPL and we will match it.

Does the AP55102 have to be coded to the engine?

Yes. Each injector carries its own trim code on the label, and the code is entered with a scan tool after the injector is installed.

Is the AP55102 new or remanufactured, and is there a core?

It is remanufactured by Alliant Power. A refundable core applies, and it comes back when we receive your old injector in rebuildable condition.

Related Parts

• Cummins ISX15 EPA10 XPI Common-Rail Fuel Injector | Alliant Power AP55101 Remanufactured
• Cummins X15 & ISX15 EPA17 to EPA24 XPI Common-Rail Fuel Injector | Alliant Power AP55128 Remanufactured
• Cummins ISX12 XPI Common-Rail Fuel Injector (2872544, 2872289) | Alliant Power AP55117 Remanufactured
• Cummins X15 & ISX15 EPA17 HE400VG Turbocharger with Actuator | Alliant Power AP90948 Remanufactured

Why Buy From Valley Fuel Injection

We are a diesel fuel-injection and turbocharger shop in Woodland, CA, rebuilding pumps, injectors and turbos on our own benches since 1993, not a drop-ship storefront. When you call, you talk to the people who test these units. We verify fitment against your engine serial, VIN or build date before anything ships, so the right part arrives the first time.

Not sure the injectors are the problem? We test and diagnose in-house before you buy. See our common rail injector testing and rebuild service.