Patent ID: 7204238

Claim:
A fuel tank with ventilation system, wherein the fuel tank ( 1 ) has a filler pipe ( 5 ) comprising a filler neck ( 6 ), with refueling sensor ( 7 ), and a liquid level sensor ( 13 ), and the ventilation system comprises an activated carbon filter ( 24 ) which, on the one hand, is connected by a first line ( 22 ) to a vapor space of the fuel tank ( 1 ) and by a second line ( 25 ) to the induction tract of an internal combustion engine, and, on the other hand, by a third line ( 26 ) to the atmosphere, and further comprising: a) a controlled two-way valve unit ( 23 ), whereof the first path connects the first line ( 22 ) to the third line ( 26 ) and the second path connects the second line ( 25 ) to the third line ( 26 ), and b) an electronic control unit ( 28 ), which on the input side is connected to the refueling sensor ( 7 ) and to the liquid level sensor ( 13 ) and on the output side is connected to the controlled two-way valve unit ( 23 ).