Motor vehicle tank subassembly and withdrawal module having a porous conveying body

A motor vehicle tank subassembly for storing and discharging an operating liquid, comprising:

• a tank defining a tank volume;
• a filling opening for introducing an operating liquid into the tank volume;
• a withdrawal opening from which any operating liquid can be withdrawn;
• a hood shaped housing within the tank;
• a conveying pump within the hood-shaped housing, having an intake side and a delivery side, the intake side being connected in pressure-transferring fashion to the withdrawal opening in order to furnish at the withdrawal opening a withdrawal vacuum which is lower in pressure relative to the pressure in the tank volume;
• a porous planar conveying body including a material defining a pore volume being received in the tank, wherein the porous planar conveying body occupies only part of the tank volume, and another part of the tank volume is devoid of the porous conveying body, the planar porous conveying body being operable to transport any operating liquid stored in the tank in its pore volume via a capillary effect, the planar porous conveying body comprising a discharge portion that is operatively connected to the withdrawal opening in such a way that the withdrawal vacuum furnished at the withdrawal opening brings about in pores of the discharge portion a discharge vacuum that overcomes the capillary effect occurring there;
• and
• a heating system including an electrically operated planar heat discharge component.