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Brief description, V6

Brief description, V6

The main system components are the fuel tank, heated fuel filter, fuel pump, common rail and injectors.

Once the engine has been started, the crankshaft will start to operate the fixed drive fuel pump. This will draw fuel from a reservoir located inside the tank and send it to the fuel filter. Fuel from the filter will then reach the feed pump in the fuel pump.

The pump supplies fuel from the fuel tank to the fuel rail at high pressure. The pressure delivered by the fuel pump is controlled by the control module and regulated by the fuel control valves on the fuel pump. The quantity of fuel per injection is proportional to the pressure in the fuel rail.

Fuel at high pressure passes from the fuel rail via separate fuel pipes to the injectors, which inject the fuel into the combustion chamber located on the piston. The fuel pressure can vary 25 - 135 MPa depending on the engine torque requested by the driver via the pedal potentiometer.

Fuel is injected by injectors into the combustion chambers. The quantity of fuel and when this is injected is controlled by the engine control module. This control module sends out a voltage and period for the injections. By controlling the opening time of the injectors and the pressure, the engine is accurately supplied with the correct amount of fuel.

The return fuel, i.e. the fuel that is not used, is collected from the return lines from each injector, the fuel rail and the fuel pump. The return fuel flows back to the fuel tank, where it drives an ejector in the tank.