The part number A0280745902 to be associated with a unit pump for the Mercedes-Benz MBE4000 engine. The MBE4000 is a heavy-duty diesel engine used in commercial vehicles, and unit pumps are critical components in the fuel injection system.

Key Details:

• Part Number: A0280745902

• Application: Mercedes-Benz MBE4000 engine

• Component: Unit pump (a part of the fuel injection system)

Possible Functions:

• Delivers high-pressure fuel to the injectors.

• Works with the engine’s electronic control module (ECM) for precise fuel metering.

• Common in diesel engines with unit injector or pump-line-nozzle systems.

• Structural Characteristics

• Compact Modular Design

• The unit pump integrates the high-pressure pump and solenoid-controlled injector into a single unit, reducing external fuel lines.

• Mounts directly on the engine block, driven by the camshaft via a roller tappet.

• High-Pressure Generation

• Uses a plunger-and-barrel assembly to generate injection pressures (typically 1,600–2,200 bar).

• Precision-machined components ensure tight tolerances for efficient fuel compression.

• Electronically Controlled Solenoid Valve

• Features an ECU-controlled solenoid for precise fuel metering and timing.

• Allows for multiple injection events (pilot, main, and post-injection) for better combustion control.

• Durable Materials

• Hardened steel plunger and barrel for wear resistance.

• Corrosion-resistant coatings to handle ultra-low-sulfur diesel (ULSD) and biodiesel blends.

• Integrated Fuel Return System

• Includes leak-off ports to return excess fuel, preventing pressure buildup and maintaining efficiency.

• Advantages

• Improved Fuel Efficiency

• Precise electronic control optimizes fuel delivery, reducing waste and improving mileage.

• Lower Emissions Compliance

• Supports cleaner combustion (meeting EPA Tier 3/4 and Euro V/VI standards).

• Enables exhaust gas recirculation (EGR) and aftertreatment compatibility.

• Enhanced Reliability

• Fewer external fuel lines reduce leak risks and maintenance needs.

• Robust construction extends service life even under heavy loads.

• Better Engine Performance

• Faster response times due to direct camshaft actuation (vs. common-rail delays).

• Stable pressure delivery improves torque output and cold-start performance.

• Simplified Diagnostics & Service

• Faults (e.g., solenoid failure, pressure loss) trigger OBD-II codes for easier troubleshooting.

• Modular replacement reduces downtime compared to full injector overhauls.