Checks For Leaks

Detach hose from valve, switch on vacuum pump at the service tester and connect it to 8 mm connection (note arrow indicating direction of flow). Set vacuum to 600 mbar and apply a voltage of 12 volts to valve. Switch off vacuum pump. Pressure drop must not exceed 50 mbar after 20 seconds. When power is not applied, fuel evaporation control valve is closed by a non-return valve to a vacuum of 20 mbar.