Supply system
Pic. 15.11. Elements of the fuel supply system: 1 - fuel filter (on the high pressure line); 2 - fuel distribution line; 3 - nozzle; 4 - tank; 5 - control valve of the pressure regulator; 6 - fuel tank filter (on the suction side); 7 - fuel pump; 8 - three-way distribution valve
An electrically driven fuel pump located inside the fuel tank supplies fuel at constant pressure to the fuel rail from which fuel is distributed to all four injectors (pic. 15.11). From the fuel rail, fuel is injected by four injectors into intake ducts located directly above the intake valves. The portion of injected fuel is strictly controlled by a microprocessor control unit, the so-called EGI unit. The pressure regulator controls the pressure in the system in accordance with the degree of vacuum in the engine intake manifold. The fuel filter, located between the distribution line and the fuel pump, provides protection against contamination of the fuel supply system components.