Fig. 2.61. Fuel knot of the Mazda 3 car: 1 – fuel tank; 2 – backpressure valve; 3 – block of the fuel pump; 4 – fuel nozzle; 5 – quencher of pulsations; 6 – relay of the fuel pump; 7 – control socket; 8 – quick-detachable connector; 9 – cover of a jellied mouth of the fuel tank

The fuel knot of the car consists of the block of the fuel pump of high pressure, the fuel tank, fuel nozzles and fuel connecting tubes (fuel-supply lines). From the fuel tank the fuel pump under pressure gives fuel to the fuel highway from where it through nozzles comes to cylinders. Nozzles dose and spray fuel. When giving tension the needle rises by a solenoid winding, passing fuel. The amount of fuel is defined by duration of an impulse during which the nozzle is open. Further fuel flows back in the fuel tank through two metal tubes located under the car bottom. The fuel pump is installed in the fuel tank (fig. 2.61).