Core Information

• Engine: Cummins ISF2.8 (also known as QSF2.8 in some industrial applications).

• Part Number: 0445020255 (This is the Cummins core part number).

• Common Name: High-Pressure Fuel Injection Pump, or more specifically, the Bosch CP1H Pump.

Key Details & Function

1. Type: This is a Bosch CP1H radial piston high-pressure fuel pump. It is driven by the engine's gear train.

2. Function: It takes low-pressure fuel from the lift pump (in the tank or on the engine) and pressurizes it to extremely high levels (up to 1600+ bar / 23,000+ psi) for delivery to the common rail. The rail then distributes this high-pressure fuel to the electronically controlled injectors.

3. Critical Role: It is the heart of the common rail fuel system. Problems with this pump can lead to a wide range of engine issues, from lack of power to a complete no-start condition.

Common Symptoms of a Failing Pump (0445020255)

If you are looking for this part, you might be experiencing:

• Hard Starting or No Start: Inability to generate sufficient rail pressure.

• Loss of Power / Engine Derate: The Engine Control Module (ECM) detects low rail pressure and limits performance.

• Engine Misfires or Rough Running: Inconsistent fuel delivery.

• Increased Fuel Consumption: Loss of pumping efficiency.

• Unusual Noises: Whining, knocking, or grinding sounds from the pump area.

• Diagnostic Trouble Codes (DTCs): Common codes include:

• P0087 - Fuel Rail/System Pressure Too Low

• P0093 - Fuel System Large Leak Detected

• P0251 - Injection Pump Fuel Metering Control "A" Malfunction (Rotor/Control Plunger)

• P0541 - Fuel Injection Pump Timing Solenoid Circuit Low

Application Scenarios

This pump is engineered for light to medium-duty, high-speed diesel engines that require a balance of performance, fuel economy, and packaging constraints. Its design scenarios include:

• High-Pressure Requirement: Applications needing rail pressures of 1400 - 1800 bar for optimal atomization and clean combustion (meeting Euro IV/V/VI and EPA Tier 4 emissions standards).

• Compact Installation: Where space on the engine is limited. The CP1H's radial design is more compact than an equivalent CP3 axial pump.

• Cost-Sensitive Applications: While precise, the CP1H's design is often more economical to produce than its multi-cylinder predecessors, making it suitable for high-volume production engines like the ISF2.8.

• Demanding Duty Cycles: It is robust enough for commercial use but is most at home in applications with relatively clean fuel systems and proper maintenance.

  
  

  
  

  Typical Equipment & Vehicles

• The Cummins ISF2.8 engine (using this pump) is one of the most widely deployed light-duty diesel engines globally. Equipment includes:

• A. Light & Medium-Duty Trucks (Most Common Application)

• Foton / Auman Trucks (China & Global Markets): The primary platform for the ISF2.8. Found in models like the Foton Ollin, Auman EST, and countless light-duty haulers.

• Dongfeng Trucks

• JAC (Jianghuai) Trucks

• Chevrolet Silverado 2500/3500 (US Market - ~2019-2023): The 2.8L Duramax turbo-diesel option was a Cummins R2.8 (a derivative of the ISF2.8), also using a Bosch CP1H pump.

• Various Global Pickup & Cargo Van Platforms.

• B. Construction & Agricultural Equipment

• Compact Wheel Loaders

• Small Excavators

• Telehandlers

• Air Compressors

• Irrigation Pumps

• Agricultural Machinery (e.g., harvesters, tractors in lower power ranges).

• C. Power Generation

• Mobile & Stationary Generators (typically in the 50 kVA - 100 kVA range) powered by the QSF2.8 industrial version.

• D. Special Vehicles

• Light-Buses & Minibuses

• Mobile Cranes

• Fire Fighting Equipment

• Refrigerated Trucks (Reefer units)

• Critical Associated Equipment (For a Successful Repair)

• When replacing the 0445020255 pump, the following associated components are highly recommended to be inspected or replaced to ensure system integrity:

• Fuel Filters: ALWAYS replace both primary and secondary fuel filters. This is non-negotiable.

• Fuel Lines: Inspect all low-pressure supply and return lines for cracks or leaks.

• Fuel Tank: Check for sediment/water contamination. The tank may need cleaning.

• Fuel Lift Pump: If the vehicle has an in-tank or inline electric lift pump, verify it is providing adequate supply pressure (specification is critical).

• Common Rail & Injectors: If pump failure sent metal debris through the system, the common rail and fuel injectors are likely contaminated and may also require service or replacement. Installing a new pump on a dirty system will cause immediate failure.

• High-Pressure Lines: The lines between the pump, rail, and injectors should be inspected for wear or internal degradation.

• Drive Coupling: The shear coupling on the old pump must be inspected. If it sheared, all fragments must be cleaned from the gear housing.

  Final Summary:
  The 0445020255 is the Bosch CP1H high-pressure fuel pump for the Cummins 2.8L engine. Failure is often due to contaminated fuel. Opt for a quality remanufactured or new unit from a trusted source, factor in the core charge, and address the root cause of the failure. Professional installation is strongly advised to ensure longevity and proper operation.
  

 Technical parameters of the Cummins ISF2.8 Fuel Injection Pump (Bosch CP1H - Part #0445020255):