Cummins 5341063 is a new, genuine Cummins high-pressure fuel pump for the Cummins ISF2.8 and QSF2.8 2.8L diesels. Bosch builds this pump, and it carries Bosch number 0445020256. It supplies the common rail that feeds the injectors.

Common reasons to replace one: hard starting, low rail pressure codes, loss of power, or metal or water in the fuel. Cummins ties fuel system parts to each engine’s build list (CPL), so check the engine dataplate first. If the old pump failed from dirty or wet fuel, fix the fuel supply and clean the rail, lines and injectors before the new pump goes in.

Specifications

Fits / Applications

• Cummins ISF2.8 2.8L diesel engine
• Cummins QSF2.8 2.8L diesel engine

Confirm the pump against your engine’s ESN and CPL. Replace the fuel filters, drain water from the fuel system, and find out why the old pump failed. If metal or water got past the pump, clean or replace the rail, lines and injectors it reached. Prime the fuel system before cranking so the new pump does not run dry.

Part Numbers & Cross Reference

Bosch 0445020256  ·  Cummins (listed with this pump by aftermarket catalogs) 5321097  ·  Bosch type code CR/CP1H3/L85/10-789S

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.

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.