Safety And Ventilation Valve; Charcoal Filter - Fiat Bravo Service Manual

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Bravo-Brava i g i

Safety and ventilation valve

This valve is located in the fuel filler cap and,

depending on the pressure in the tank, carries

out the f o l l o w i n g functions:

- When the pressure inside the fuel tank ex-

ceeds 0.13 - 0.18 bar, it allows the excess

vapours t o be discharged outwards (safety

- If, conversely, there is a vacuum of 0.020 -

0.030 bar in the tank, it allows the intake of

air (ventilation function).

The charcoal filter is located in the right

wheel arch; to gain access to it, remove the

rear part of the right front wheel arch liner.

It consists of granules of charcoal (4) w h i c h

trap the petrol vapours entering through the

intake ( 5 ) .

The scavenging air w h i c h enters through the

intake ( 1 ) , through the paper filter

comes into contact w i t h the granules and d i -

rects them towards the outlet (2) and from

there towards the cut-out valve.

The air, having entered through the intake

(5), can also be recalled by the vacuum in the

tank to ventilate the actual tank. The parti-

tion (6) ensures that the air drawn in comes

into contact w i t h all the granules of charcoal

assisting the release of petrol vapours t o -

wards the inlet manifold.

There are also t w o springs (7) w h i c h allow

the mass of granules to expand w h e n the

pressure increases.