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Cummins ISF3.8 Series 3.8L Turbocharged Diesel Engine High-Pressure Common Rail and Fuel Injection Pump Bosch/Denso
Core Summary Cross-Reference Table
| Part Name | Cummins Part Number (Cummins OE) | Manufacturer Part Number (Bosch / Denso) | Applicable Engine Model |
|---|---|---|---|
| High-Pressure Fuel Common Rail | 5335558 | 0445214353 (Bosch) | Cummins ISF3.8 / QSF3.8 |
| High-Pressure Fuel Injection Pump (Option A) | 5303387 | 0445020517 (Bosch) | Cummins ISF3.8 |
| High-Pressure Fuel Injection Pump (Option B) | 5318651 | 294000-1631 (Denso) | Cummins ISF3.8 |
High-Pressure Fuel Common Rail 0445214353 / 5335558
Common Fault Symptoms
1. Aging of internal electronic components in the rail pressure sensor (triggering fault code P0088 for excessive pressure or P0087 for insufficient pressure).
2. Wear on the pressure limiting valve causing premature pressure release, resulting in speed limitation and a lack of power under high-load conditions.
Bosch High-Pressure Fuel Pump 0445020517 / 5303387
Common Faults and Maintenance
1. Extremely high standards apply to the diesel filter. If inferior diesel (containing excessive water or impurities) is used, the plunger is highly susceptible to wear or even "mechanical seizure."
2. Clogging of the fuel metering valve screen can cause the engine to shake at idle or fail to start.
Denso System High-Pressure Fuel Pump 294000-1631 / 5318651
Common Faults and Maintenance: Wear of the SCV (Suction Control Valve) is the most frequent issue with Denso pumps. Such wear can cause the engine speed to fluctuate (hunt) while idling, or result in occasional surging or hesitation during acceleration.
When replacing, it is recommended to also replace the coarse diesel filter (with water-fuel separation) and the fine filter.
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