This is the Bosch 0445120251, a new genuine Bosch common-rail fuel injector, not a rebuild. It is the injector Cummins sells as 5263314, and catalogs list it for the QSB6.7, the 6.7L inline six industrial engine. The engine takes six. Several other QSB injectors look much the same, so the part number is the only safe way to match it.

Hard starting, a miss, smoke, fuel in the oil, low power or a cylinder that drops out on a cutout test are the usual reasons these come out. Dirt and water in the fuel are what wear the nozzle and control valve, so change the filters and find the source before the new injector goes in. Cummins used more than one injector on QSB engines. Bosch 0445120231 (Cummins 5263262), Bosch 0445120177 (Cummins 5254261) and Bosch 0445124019 (Cummins 5289266) are different parts, so order by the number on your old injector or by engine serial number.

Specifications

Fits / Applications

• Cummins QSB6.7 industrial engines that call for Cummins injector 5263314
• Six injectors per engine
• Not the same injector as Bosch 0445120231 (Cummins 5263262), Bosch 0445120177 (Cummins 5254261) or Bosch 0445124019 (Cummins 5289266)
• Match the Bosch or Cummins number on your old injector before you order

Use a new sealing washer and O-ring on each injector, and inspect the high-pressure connector (feed) tube for that cylinder. Replace any tube with a worn or marked sealing tip. Change the fuel filters and flush out any water or dirt before start-up. Follow the Cummins service information for your engine for any injector setup step with Cummins INSITE or an equivalent service tool.

Part Numbers & Cross Reference

Cummins 5263314  ·  Cummins (suffix versions) 5263314NX, 5263314PX, 5263314RX

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

Will the Bosch 0445120251 fit my Cummins QSB6.7?

Only if your engine calls for Cummins injector 5263314. QSB6.7 engines were built with more than one injector, so read the Bosch or Cummins number off the old one, or call 530-668-0818 with the engine serial number and CPL.

Is 0445120251 the same injector as Bosch 0445120231?

No. 0445120231 is Cummins 5263262 and 0445120251 is Cummins 5263314. They look alike, so match the number on the injector you are replacing.

What Cummins number does the 0445120251 replace?

Cummins 5263314. Cummins also sells the same injector with suffix numbers 5263314NX, 5263314PX and 5263314RX.

Is it new or remanufactured?

It is a new genuine Bosch injector, not a rebuild. The QSB6.7 takes six, and this listing is for one injector.

Related Parts

• Cummins QSB6.7 Tier 4 Common-Rail Fuel Injector | Bosch 0445124019 New (Cummins 5289266)
• Cummins QSB6.7 & ISB6.7 Common-Rail Fuel Injector | Alliant Power AP55177 Remanufactured (Cummins 5254261)
• Cummins QSB4.5, QSB5.9 & QSB6.7 Common-Rail Fuel Injector | Alliant Power AP55597 Remanufactured
• Cummins QSB 4.5 & QSB 6.7 Tier 3 CP3 Injection Pump | Bosch 0445020122 New (Cummins 5256607)

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.