3022423 - 1080E evaporation control system
OPERATION
The vapours coming from the tank through the two float valves (1) are sent to the separator (2).The vapours condensed in the separator fall back into the tank.Uncondensed vapours are sent through the pipe (3) to the canister (4), where they are absorbed and stored by the activated charcoal.The vapours pass to the inlet box through the solenoid (5) controlled by the fuel injection control unit.Multi-function valves
The multi-purpose valves have the following functions:
- pressurizing the tank
- ventilating the tank
- retention
- seal in the event of roll-over
PRESSURIZING THE TANKThe tank is maintained at a pressure of
30-45 mbar by means of a valve which rests on a sealing edge.The valve is supported by a stainless steel
plate and counteracted by a spring.When the pressure in the tank exceeds the
specified value, it overcomes the resistance of the spring and the
valve is able to rise, allowing vapours to flow to the canister.When the pressure returns to the correct
limits, the valve closes again.RETENTION
Under particular driving conditions, a vacuum could be created in the tank because of:
- temperature changes
- fuel consumption.
Canister
Mounted in the front right wheelarch, this consists of an activated-charcoal filter element which absorbs the fuel vapours coming from the separator.A one-way valve allows external (scrubbing) air to enter during vapour intake.1 - From the multi-function valve
2 - To the solenoid valve
3 - One-way scrubbing valve