Fig. 2.61. Fuel unit of the Mazda 3: 1 – fuel tank; 2 – check valve; 3 – fuel pump block; 4 – fuel injector; 5 – pulsation damper; 6 – fuel pump relay; 7 – control connector; 8 – quick release connector; 9 – fuel tank filler cap
The fuel unit of the vehicle consists of a high-pressure fuel pump unit, a fuel tank, fuel injectors and fuel connecting pipes (fuel lines). From the fuel tank, the fuel pump supplies fuel under pressure to the fuel line, from where it enters the cylinders through the injectors. The injectors dose and spray the fuel. When voltage is applied to the solenoid winding, the needle rises, passing fuel. The amount of fuel is determined by the duration of the pulse during which the injector is open. Then the fuel flows back to the fuel tank through two metal tubes located under the bottom of the car. The fuel pump is installed in the fuel tank (Fig. 2.61).