Liquid tank for motor vehicles, having a retention component retaining liquid close to a withdrawal opening

A liquid tank having a tank interior space delimited by a tank wall and fillable with an associated liquid, and having a withdrawal opening for withdrawing the associated liquid from the tank interior space;

• a retention component that delimits a component interior region being arranged in the tank interior space;
• the component volume of the component interior region being less than the tank volume of the liquid tank;
• a partition of the retention component permitting a flow of the associated liquid, out of a component exterior region located outside the component interior region but inside the tank volume, through the partition into the component interior region and presenting a flow resistance to a flow out of the component interior region through the partition into the component exterior region in such a way that the partition exhibits a liquid retention capability with respect to surging movements of the associated liquid in the component interior region;
• the withdrawal opening being arranged in such a way that at least as soon as a level falls below a threshold, the partition is arranged between the withdrawal opening and a liquid quantity received in a component exterior region of the tank interior space,
• wherein the retention component is flowthrough-capable at least in portions only unidirectionally from the component exterior region into the component interior region, but not in the opposite direction.