Tightness of tank ventilation system testing method, e.g. for motor vehicles, involves adjusting ventilation of tank system and with source of under or over pressure is provided

摘要

The method involves adjusting ventilation of a tank system and with a source of under or over pressure is provided. The pressure is collected and temporarily terminated by the pressure source (50), if the under or over pressure reaches a pre-determined threshold value or if a pre-determined time is passed since the beginning of the pressure, or if the temporal change falls below a pre-determined second threshold value. A pre-determined time after completion and bringing in the pressure, characteristics are recorded, with tightness of the tank system is closed.