Bosch CP3 part number 0445020027. This is a very specific and popular high-pressure fuel pump used primarily in the 2010-2018 Dodge (Ram) Cummins 6.7L applications, though it is often used as an upgraded replacement for earlier models as well.
Here is the breakdown of this specific pump and its application:
1. The Identification
Part Number: 0445020027 (Bosch OEM number)
Common Reference: RAS 43227
Type: Bosch CP3.2 (Common Rail Pump)
Fuel System: High Pressure Common Rail (HPCR)
2. Vehicle Application (OEM Fitment)
This specific pump was factory installed on:
3. The "CP3 vs. CP4" Context (Why this matters)
If you are looking at this pump for a 2019+ truck, here is important context:
2019+ Rams came factory with a Bosch CP4 pump.
The CP4 is known for being failure-prone (especially with lift pump failure or poor lubrication, sending metal shrapnel through the entire fuel system costing $10k+ to repair).
The "CP3 Conversion": Many owners of 2019-2024 (and current 2025+) Ram Cummins trucks perform a "CP3 Conversion" using this exact pump (0445020027) to replace the problematic CP4. It bolts on with an adapter kit.
4. Specifications & Details
Flow Rate: This pump flows approximately 220cc to 240cc of fuel at stock levels.
Pressure: It is capable of generating the high pressure needed for the 6.7L injectors (typically 26,000+ PSI).
Lubrication: Unlike the CP4, the CP3 is far more tolerant of marginal fuel lubrication (like USLD fuel).
Gear: It features the standard CP3 gear drive pattern required for the Cummins engine timing case.
5. Common Reasons for Purchase
Direct Replacement: If you have a 2010-2018 truck with a failed pump, this is the stock replacement.
CP4 Disaster Prevention Kit: If you have a 2019+ truck, buying this pump and an adapter plate (like the S&S or Fleece performance kit) is a common reliability upgrade.
Performance Upgrades: While this specific pump is stock for 2010-2018 trucks, it can support mild performance tunes (up to about 500-550 HP) without issues. For higher horsepower, you would need a modified CP3 or a dual pump setup.
Diesel pump supplier:
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