Fuel System Description

Components







The fuel system consists of many tiny holes and spaces that allow the movement of fuel from one place to another. These holes and spaces are milled to extremely high precision. This is especially true of the fuel injectors.

The fuel injector is very sensitive to foreign material. Foreign material will result in fuel system breakdown. Exercise great care not to allow the entry of foreign material into the fuel system or fuel injectors during the removal and installation procedure.

CAUTION: To avoid electric shock;
Set the switch to the 'OFF' position and disconnect battery negative cable before checking or repairing the fuel injector, wiring or/and connectors.






The common rail system uses a type of accumulator chamber called the fuel rail to store pressurized fuel, and injectors that contain electronically controlled solenoid valves to spray the pressurized fuel in the combustion chambers. The injection system (injection pressure, injection rate, and injection timing) is controlled by the engine control module (ECM), and therefore the common rail system can be controlled independently, free from the influence of engine speed and load. This ensures a stable injection pressure at all times, particularly in the low engine speed range, so that black smoke specific to diesel engines generated during vehicle starting or acceleration can be reduced dramatically. As a result, exhaust gas emissions are clear and reduced, and higher output is achieved.

1. High Pressure Control
- Enables high pressure injection from low engine speed range.
- Optimizes control to minimize particulate matter and NOx emissions.

2. Injection Timing Control
- Enables finely tuned optimized control in accordance with running conditions.

3. Injection Rate Control
- Pilot injection control that performs a small amount of injection before the main injection.

The fuel rail system consists primarily of a fuel supply pump, fuel rail, injectors, and engine control module (ECM).