Fuel Circuit - MOTO GUZZI V10 CENTAURO Werkstatt-Handbuch

12.3 FUEL CIRCUIT (Fig.12-01)
The electric pump "1" sends the tank fuel through a filter «2» to the electro-injectors «3».
The fuel pressure in the circuit is kept at a fixed level by the pressure control «4», which controls the amount of
fuel flowing back to the tank.
Fuel electric pump «1»
The pump is a positive displacement roller type and the driving electric motor is fully immersed in the fuel.
The motor is a brushed type and excited with permanent magnets.
When the electric motor drives the rotor of the pump volumes of fuel are continuously displaced from the intake
to the delivery output.
These volumes are the spaces between the rollers of the pump rotor that rotates along the external ring of the
pump body.
The pump is equipped with a check valve to prevent emptying the fuel circuit when the pump is not working,
The same pump is also equipped with a pressure-limiting valve which puts in short circuit the input and the output
of the pump when a pressure in excess of 5 bar occurs.
In that way it's possible to prevent the overheating of the pump electric motor.
The technical data of the system are: Flow rate 100 litres per hour at 3 bar; electrical voltage 12 volts; load current
4÷5Amps.
NOTE: It is highly recommended to clean accurately the whole parts in case of disassembling.
Fuel filter «2»
The filter has a paper-filtering element with a surface of 1200 sqcm, and the mesh size of 10 microns.
This element is absolutely necessary to prevent clogging in the injectors elements which are very sensitive to
unwanted particles.
The filter is mounted between the fuel pump and the left throttle and an arrow is hobbed on the filter case that
indicates the flow of the fuel.
The filter must be substituted every 10.000 Km.
Electro-injectors «3»
These devices control the fuel quantity injected into the engine.
The injectors are a bi-stable control elements that is they can only be in one of the two positions "open" or "closed".
The injectors are basically a needle valve where the needle is actuated by a small electro magnet attached to it.
The needle is kept in the "closed" position against the seat of the valve by a cylindrical compression spring whose
load can be adjusted by a spring loader.
The solenoid of the magnet is embedded in the rear part of the injector body.
The seat of the needle valve and the needle guide are located in the front part of the injector.
The position of the needle is controlled by the impulses of the electronic control unit.
Each impulse creates a magnetic field in the solenoid that attracts the needle towards the "open" position.
The timing of the "open" position of the needle valve is given by the electronic control unit. This determines the
fuel injection control in relation to the power demand of the engine.
The fuel, injected with a pressure of 3 ± 0.2 bar, nebulizes in a cone of about 30°.
The Ohmic resistance of the solenoid is 12 Ohms.
To check the injector electrically, apply a voltage not exceeding 6 Volts, for very short periods.
INJECTOR IW724 INJECTOR IW031
12-03
12-02
DAYTONA RS / V10 CENTAURO SPORT 1100 I
105