Fuel Pressure Regulator; Fuel Injector - Cagiva Navigator Workshop Manual

FUEL PRESSURE REGULATOR

The fuel pressure regulator is a diaphragm release valve that consists of a diaphragm, spring and a valve. It
always maintains the pressure of the fuel to the injector at 2.9 kg/cm
carburettor. When the fuel pressure rises more than 2.9 kg/cm
the fuel opens the regulator valve and therefore the excess fuel returns to the fuel tank via the return fuel tube.
(Closed valve)
Suction
Valve

FUEL INJECTOR

The fuel injector consists of a solenoid, piston, needle valve and filter.
The injector is an electro-magnetic injection jet that injects the fuel into the carburettor according to the signals
received from the ECM.
When the ECM agitates the solenoid, it becomes an electro-magnet that attracts the piston. At the same time, the
needle valve incorporated in the piston opens and the injector, under pressure from the fuel, injects the fuel in a
conical dispersion. As the opening movement of the needle valve is constant, the volume of fuel injected each time
is determined by the agitation period of the solenoid (injection time).
Injection holes
C.12
INJECTION - AIR INTAKE SYSTEM
Suction
Spring
Diaphragm
Fuel from
the pump
Needle valve
Piston
2
(290 kPa) higher than the pressure in the
2
(290 kPa) above the pressure in the carburettor,
(Open valve)
Valve
Fuel returns
to the tank
Solenoid
Spring
Diaphragm
Fuel from
the pump
Filter