Motor vehicle tank system having a motor vehicle tank and having a venting apparatus (21, 22, 23) for venting a tank volume of the motor vehicle tank, wherein the motor vehicle tank is, via the venting apparatus (21, 22, 23), a venting line which is fluidically connected to the venting apparatus (21, 22, 23), and a regulating valve which is fluidically connected to the venting line, able to be fluidically connected directly to an intake tract of an internal combustion engine such that no activated carbon filter is arranged in this venting path, wherein the motor vehicle tank system has the following features: - the venting apparatus (21, 22, 23) comprises an operational venting valve for venting the tank volume during operation of a motor vehicle which comprises the motor vehicle tank system, wherein the operational venting valve is fluidically connected to the motor vehicle tank and, by means of an operational venting line, to the venting line; and - the venting apparatus (21, 22, 23) comprises a refuelling venting valve for venting the tank volume during a refuelling process of the motor vehicle tank, wherein the refuelling venting valve is fluidically connected to the motor vehicle tank and, by means of a refuelling venting line, to the venting line, wherein the motor vehicle tank system is characterized by the following features: - the motor vehicle tank system also comprises a 3/2-way valve, which is fluidically connected to the operational venting valve, the refuelling venting valve and the venting line; - the 3/2-way valve is able to be adjusted electrically and/or electromagnetically between an operational venting position and a refuelling venting position; - in the operational venting position, the operational venting valve is fluidically connected to the venting line by means of the 3/2-way valve; and - in the refuelling venting position, the refuelling venting valve is fluidically connected to the venting line by means of the 3/2-way valve. - the venting apparatus (21, 22, 23) comprises an operational venting valve for venting the tank volume during operation of a motor vehicle which comprises the motor vehicle tank system, wherein the operational venting valve is fluidically connected to the motor vehicle tank and, by means of an operational venting line, to the venting line; and - the venting apparatus (21, 22, 23) comprises a refuelling venting valve for venting the tank volume during a refuelling process of the motor vehicle tank, wherein the refuelling venting valve is fluidically connected to the motor vehicle tank and, by means of a refuelling venting line, to the venting line, - the motor vehicle tank system also comprises a 3/2-way valve, which is fluidically connected to the operational venting valve, the refuelling venting valve and the venting line; - the 3/2-way valve is able to be adjusted electrically and/or electromagnetically between an operational venting position and a refuelling venting position; - in the operational venting position, the operational venting valve is fluidically connected to the venting line by means of the 3/2-way valve; and - in the refuelling venting position, the refuelling venting valve is fluidically connected to the venting line by means of the 3/2-way valve.