Leak diagnostic method for fuel vapour recovery system

摘要

A pressure sensor is provided for determining the pressure in the system and a pressure differential sensor (6) for determining a pressure alteration. With a leakage unit air from the outside flows in or vaporised fuel is discharged to the outside. The leakage of the system is determined by comparing an operating condition of the leakage unit and a non operating condition of the leakage unit. The IC engine has a main fuel container (1) and a tank (2), a first control valve (3) used for emptying or flushing, a control stop valve (4) and a third control measuring valve (5) and a control system (7).