Charcoal Filter And Fuel Vapour Cut Out Solenoid Valve; Vapour Cut Out Solenoid Valve - Fiat Bravo Service Manual

E n g i n e
Fuel system
A N T I - E V A P O R A T I O N S Y S T E M C O M P O N E N T S

Charcoal filter and fuel vapour cut out solenoid valve

These components form part of the fuel vapour recovery and anti-evaporation system. The charcoal filter
is located in the right wheel arch and the rear section of the right front wheel arch liner has to be re-
moved to gain access to it.
The cut out solenoid valve is located in the engine compartment under the inlet manifold.
1. Inlet connector
2. One-way valve
3. Spring
4. Shutter
5. Outlet port
6. Electro-magnet
7. Outlet connector
36
Charcoal filter
This consists of charcoal granules (4) w h i c h
trap the petrol vapours entering through the in-
let (5).
The air w h i c h enters through the intake (1),
passes through the paper filter ( 3 ) , comes into
contact w i t h the charcoal granules removing
the petrol vapours and directing them towards
the outlet (2) and from there to the cut out sole-
noid valve.
The air, having entered through the intake (5),
can also be recalled by the vacuum in the tank
for ventilating it. The partition (6) ensures that
the air drawn in comes into contact w i t h all the
granules of charcoal assisting the release of the
petrol vapours to the inlet manifold.
There are also two springs (7) w h i c h allow the
expansion of the mass of granules when the
pressure increases.

Vapour cut out solenoid valve

(0.280.142.340)
The function of this valve is, by means of the
electronic control unit, to control the quantity of
petrol vapours drawn in by the charcoal filter
and directed to the inlet manifold.
If this valve is not supplied, it is open; by turning
the key to the ON position, it closes, in prepara-
tion for operation. In effect, if energized the sol-
enoid valve (6) attracts the shutter (4) w h i c h ,
overcoming the spring (3) loading, closes the
port (5) preventing the f l o w of petrol vapours.
The operation is controlled by the electronic
control unit in the following way:
- during starting the solenoid valve remains
closed, preventing the petrol vapours from ex-
cessively enriching the mixture;
- with the engine started up, the electronic
control unit sends the solenoid valve a signal
which modulates the opening.
In this way the control unit controls the quantity
of petrol vapours sent to the inlet, avoiding sub-
stantial variations (especially during idling) in
the mixture strength.
NOTE The solenoid valve must be fitted in the cor-
rect position: the arrow on the casing should
be pointing towards the vacuum pick up on
the inlet manifold.
Bravo I P 20v
98 range
Print no. 506.670/17