The 414799012 Unit Pump is a fuel injection component designed for Mercedes-Benz MBE900 series engines. These engines are commonly used in medium and heavy-duty trucks, buses, and industrial applications.

Key Features:

• Compatible with MBE900 engines (e.g., MBE926, MBE936, MBE944, MBE954).

• High-pressure fuel injection for efficient combustion.

• Precision-engineered to meet OEM specifications.

• Durable construction for long service life.

Common Applications:

• Feightliner, Thomas Built Buses, and other vehicles with MBE900 engines.

• Industrial and generator applications.

Symptoms of a Failing Unit Pump:

• Hard starting or no-start condition.

• Poor engine performance or misfires.

• Excessive smoke from the exhaust.

• Fuel leaks around the pump.

Replacement Tips:

• Ensure proper torque specs during installation.

• Check the fuel system for contamination.

• Use OEM or high-quality aftermarket pumps for reliability.

• Electronically Controlled Unit Pump (EUP) System — Unlike traditional mechanical pumps, this unit pump is part of an advanced electronic fuel injection system that:
  ✔ Delivers ultra-high injection pressure (up to 23,000 psi or ~1,600 bar), improving fuel atomization for better power and emissions control.
  ✔ Uses precise electronic timing (controlled by the ECU) for adaptive fuel delivery, enhancing performance under varying loads.
  ✔ Reduces emissions (NOx & particulates) by ensuring cleaner, more efficient combustion.

• Why It Matters for MBE900 Engines?

• Critical for reliability in heavy-duty applications (trucks, buses, industrial equipment).

• Directly impacts fuel economy and power output—failure can cause poor performance or engine shutdown.

• Designed for durability but requires proper maintenance (clean fuel, no air ingress).