Fiat Bravo Service Manual page 254

Engine
Fuel system
10.
P4A44BJ03
Bravo-Brava iggi**
Safety and ventilation valve
This valve is located in the fuel filler cap and
carries out the following functions:
- discharging the excess pressure outwards
which forms inside the tank (safety func­
tion); the pressure acts on the plate (2)
and, overcoming the spring (1) loading, al­
lows the excess vapours to be discharged
outwards;
- allowing the flow of outside air in the tank
when an excessive vacuum is formed in­
side the tank through the effect of the fuel
consumption (ventilation function): when
the vacuum exceeds the loading of the
spring (4), it moves the valve (3), allowing
the intake of air.
Active charcoal filter
This is made up of granules of charcoal (4)
which trap the vapours entering through the
inlet (5).
The scavenging air which enters through the
inlet (1), passes through the paper filter (3),
comes into contact with the charcoal gran­
ules removing the vapours and directs them
towards the outlet (2) and from there to­
wards the filter valve.
The air, having entered through the inlet (5)
can also be sent by the vacuum into the tank
for ventilation.
The partition (6) ensures that the warm scav­
enging air drawn in comes into contact with
all the granules of charcoal.
There are also two springs (7) which allow
the expansion of the mass of granules when
the pressure increases.
Charcoal filter solenoid valve
This valve, of the normally closed type, con­
trols the flow of vapours reaching the inlet
manifold and is operated by the control unit
with duty-cycle operation.
NOTE The inlet which has the word CAN
(canister) written on it should be
connected to the charcoal filter.
1. From the charcoal filter
2. To the inlet manifold
44
Print no. 506.670