Safety and ventilation valve

Safety and ventilation valve

This valve is located in the fuel filler cap and, depending on the pressure in the tank, carries out the following functions:

• When the pressure inside the fuel tank exceeds 0.13 - 0.18 bar, it allows the excess vapours to be discharged outwards (safety function).
• If, conversely, there is a vacuum of 0.020 - 0.030 bar in the tank, it allows the intake of air (ventilation function).

Charcoal filter

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) which trap the petrol vapours entering through the intake (5).

The scavenging air which enters through the intake (1), through the paper filter (3), comes into contact with the granules and directs 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 partition (6) ensures that the air drawn in comes into contact with all the granules of charcoal assisting the release of petrol vapours towards the inlet manifold.

There are also two springs (7) which allow the mass of granules to expand when the pressure increases.