MaxxForce® 15 Engine Training - Program 1

Module 4: Fuel System 27 be integrated into the filter module, or mounted remotely.

Low-pressure & High-

Pressure Pump

The low-pressure pump is mounted on the back of the high–pressure pump.

The low-pressure pump is internally regulated with an output of approximately 72-150 psi, or 5 to 10 bar.

This pump is not serviceable and must be replaced as an assembly.

The high-pressure pump is driven by the gear train. When looking at the engine from the flywheel, the high pressure pump rotates clockwise.

Because of this, the pump is not interchangeable with any other application.

During operation, the pump increases the fuel pressure in the common rail from 12,574 psi, or 867 bar, at idle, to a maximum of 31,900 psi, or 2,200 bar, when at full load and rated speed.

The fuel pressure control valve is mounted on the rear of the pump. The

ECM uses a pulse width modulated signal on the ground side of the circuit to regulate rail pressure.

“The high-pressure pump is driven by the gear train.”