Alarm Gate G1 Evap engine missing due to degeneration of the gate making Eavp was unable to finish the procedure. And therefore cause problems falling within the Evap cover powder.
Air Evap Alarm Gate G1 absence due to deterioration of the gate makes Eavp can not complete the process. Thus causing the powder to fall within the cap Evap.
The machine Evap Alarm Gate G1 absent due to deterioration of the gate to Eavp cannot work completed in the process. Therefore the powder fall inside the lid Evap.