Bosch common rail injector 0445120254, Cummins part number 5263317, for the ISB and QSB 5.9 L — the 24-valve common rail six used in Dodge Ram 2500/3500 pickups from 2003 to 2007 and in a long list of QSB industrial, ag and marine packages built on the same block.

This is the injector we see on hard starting, a miss that will not clear with a fuel filter, black smoke under load, or a cylinder-specific fault. We flow-test injectors on our own bench in Woodland, so if you are not certain which holes are down we can tell you before you buy six.

Specifications

Fits / Applications

• 2003-2007 Dodge Ram 2500 / 3500 — 5.9 L Cummins ISB, 24-valve common rail
• Cummins QSB 5.9 industrial, agricultural and marine packages of the same era
• Common rail ISB/QSB only — not for the earlier 24-valve VP44 or 12-valve mechanical engines
• Six injectors per engine

Part Numbers & Cross Reference

Bosch 0445120254  ·  Cummins 5263317 / 5263313

Original-equipment numbers on these platforms change with engine serial, model year and emissions tier, so we do not publish a blanket interchange list that might send you the wrong part. Send us your engine serial number or VIN and we will confirm the exact match against your build before anything ships — that check is free and takes a few minutes.

Looking for the Bosch-remanufactured exchange version of this injector for the same engines? See our Cummins ISB/QSB reman injector, Bosch 0986435512.

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 flow-test and diagnose injector complaints in-house — see our injector testing service before you buy a full set.