Removal/refitting

A one-way valve admits outside air when the va-pours are sucked in. This is to carry out a washing ac-tion on the active carbon. It is possible to test the tightness of the system connecting as described in the specific procedure to the housing of the one-way valve after removing the valve.

1. From the multi-purpose valve
2. To the solenoid valve
3. One-way washing valve

REMOVAL/REFITTING

• Remove the right front wheel and wheel arch (see GROUP 70).

1. Disconnect the electrical connection from the fuel vapour solenoid valve.
2. Disconnect the vapour delivery pipe to the engine intake from fuel vapour solenoid valve.
3. Slacken the screw of the fuel vapour filter fastening clamp.

• Lower the fuel vapour filter just enough to disconnect the fuel vapour inlet pipe, then remove the filter.
• On the bench, separate the solenoid valve complete with connection pipe from the fuel vapour filter.

FUEL VAPOUR SOLENOID VALVE

This valve is controlled by the Motronic control unit and its purpose is to let the fuel va-pours stored in the canister pass through to send them to the engine intake.

The valve enclosed in the casing comprises a mobil-e part or shutter, constrained to a plate spring; the fixed part is formed of a metal cylinder perforated inside on which the coil is wound. The device is structured so that when the coil is supplied, the shutter is attracted against the cylin-der, which replaces the fixed part of the valve and closes it.

REMOVAL/REFITTING

• Set the car on a lift.
• Disconnect the battery (-) terminal.
• Remove the right front wheel and wheel arch (see GROUP 70).

1. Release the solenoid valve from the support bracket and disconnect the electrical connection.
2. Disconnect the fuel vapour delivery pipe to the engine intake from the solenoid valve.
3. Disconnect the solenoid valve connection pipe from the fuel vapour filter.
4. Remove the fuel vapour solenoid valve complete with pipe and separate them on the bench.