This is a new, genuine Bosch CP4.2 high-pressure common-rail fuel pump, Bosch 0445020609. Cummins sells the same pump as 5302736 and 5529762. It fits Cummins QSB4.5 and QSB6.7 Tier 4 industrial engines, the 2013-2014 and newer engines used in off-highway equipment. The CP4.2 has two pumping pistons on a two-lobe cam and builds rail pressure for the common-rail injectors.

The CP4 is lubricated only by the fuel that runs through it. Water, air on the supply side, dirty fuel and missed filter changes wear the cam and roller, and a failing pump can shed metal into the whole high-pressure system. Hard starting, low rail pressure codes and loss of power are common signs. If the old pump made metal, the rail, lines and injectors carry that debris, so plan on a full fuel-system cleanup, not just a pump swap.

Specifications

Fits / Applications

• Cummins QSB6.7 Tier 4 industrial engine (catalogs list 2013-2014 and newer)
• Cummins QSB4.5 Tier 4 industrial engine (2013 and newer)

The CP4.2 is lubricated only by diesel fuel. Find the cause of the old pump failure before you install this one. If there is metal in the filters, treat it as a full fuel-system job: the rail, lines and injectors carry the debris. Replace the fuel filters, check supply-side pressure and volume, look for air leaks, and prime per the Cummins procedure. Keep water out of the fuel. Check whether your drive gear and bracket need to move to the new pump.

Part Numbers & Cross Reference

Cummins 5302736  ·  Cummins 5529762  ·  Cummins ReCon (remanufactured equivalent) 5302736RX  ·  Cummins ReCon (remanufactured equivalent) 5529762RX  ·  Cummins (PX suffix) 5302736PX  ·  Bosch alternate number 0445020615

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 help you confirm the exact match against your build before you order. That check is free and takes a few minutes.

Frequently Asked Questions

Will Bosch 0445020609 fit a Tier 3 QSB4.5 or QSB6.7?

No. Earlier Tier 3 QSB4.5 and QSB6.7 engines use a Bosch CP3 (0445020122, Cummins 5256607), which is a different pump. Call 530-668-0818 with the engine serial number (ESN) and CPL number from the engine data plate and we confirm your build at no charge before anything ships.

Which Cummins numbers match Bosch 0445020609?

Cummins sells the same pump as 5302736 and 5529762. The alternate Bosch number is 0445020615.

My old CP4.2 left metal in the filters. Is swapping in 0445020609 enough?

No. If there is metal in the filters, treat it as a full fuel-system job, because the rail, lines and injectors carry the debris. Replace the fuel filters, check supply-side pressure and volume, look for air leaks, and prime per the Cummins procedure.

Is 0445020609 a new pump or a reman, and is there a core?

It is a new, genuine Bosch CP4.2 in original packaging. No core charge is added and there is nothing to send back.

Related Parts

• Cummins QSB6.7 Tier 4 Common-Rail Fuel Injector | Bosch 0445124019 New (Cummins 5289266)
• Cummins QSB 4.5 & QSB 6.7 Tier 3 CP3 Injection Pump | Bosch 0986437310 Remanufactured
• Cummins QSB4.5, QSB5.9 & QSB6.7 Common-Rail Fuel Injector | Bosch 0445120231 New (Cummins 5263262)

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 run our test benches. Confirm fitment with your engine serial number, VIN or build date before you order, and call us if you want help checking it, so the right part arrives the first time.