FUEL INJECTOR
The fuel injector consists of a solenoid, piston, needle valve and a filter.
The injector is a small electromagnetic injection nozzle that injects fuel into the carburettor according to the sig-
nal coming from the ECU.
When the solenoid is agitated by the ECU, it becomes an electromagnet and attracts the piston. At the same time,
the needle valve incorporated in the piston opens and the injector, under pressure of the fuel, injects the fuel in
a conical dispersion. Given that the opening of the needle valve is constant, the volume of fuel injected at any
one time is dependent on the time that the solenoid is agitated (injection time).
FUEL PRESSURE REGULATOR
The fuel pressure regulator is a diaphragm pressure release valve that consists of a diaphragm, spring and valve.
It always maintains the pressure of the fuel sent to the injector equal to the following value:
- F4 MY10 -> MY12: 3,0 kg/cm
2
(300 kPa)
- F4 MY13: 3,5 kg/cm
2
(350 kPa)
When the pressure of the fuel rises above this value, the excess fuel opens the valve of the regulator and there-
fore can return to the fuel tank.
- 6-
Air intake injection system
D
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