Fuel System

The fuel system used on the Direct Injection (DI) turbo diesel engine is controlled by the Powertrain Control Module (PCM).
The fuel system components consist of:
^ electric inline fuel pump.
^ high-pressure oil pump.
^ fuel filter.
^ Oil Pressure Regulator.
^ Oil Pressure Sensor.
^ Fuel Pressure Regulator.
^ high-pressure oil pump reservoir.
^ water in fuel switch/fuel heater thermostat.

Fuel is drawn from the fuel tank by the electric fuel pump. The fuel is then supplied under low pressure, 310-448 kPa (45-65 psi), to the fuel filter/water separator assembly.

Fuel to be supplied to the combustion chambers passes through the fuel filter/water separator assembly into the cylinder head galleries, then through the hydraulically actuated/electronically controlled fuel injectors.

The period of time the fuel injector nozzle tips are energized is controlled by the Powertrain Control Module.

Excess fuel not used by the engine bypasses the fuel filter/water separator assembly, flows through the Fuel Pressure Regulator assembly, and returns to the fuel tank.