Tank arrangement having a mechanical pressure regulator, and vehicle

A tank arrangement, having

• a fuel tank having a plurality of fuel chambers and configured as a saddle tank, each fuel chamber having a pump unit;
• a tank installation unit arranged in the fuel tank;
• a fuel pump element located in a first chamber of the plurality of fuel chambers and set up to provide fuel from the tank arrangement to a fuel consumer;
• a pump unit arranged in a second chamber of the plurality of fuel chambers and configured as a suction jet pump, the pump unit operatively connected to the fuel pump element and set up to deliver fuel from the second fuel chamber into the tank installation unit;
• a tank level sensor located in the second chamber of the plurality of fuel chambers, the fuel pump element controllable as a function of a signal of the tank level sensor;
• and
• a pressure regulating element functionally arranged between the fuel pump element and the pump unit, wherein the pressure regulating element is configured as a mechanical pressure regulator, and wherein the fuel pump element is actuatable in such a way that the system pressure is increased, starting from a system pressure, at which the pressure regulating element is closed, until the pressure regulating element is open such that fuel is delivered by the pump unit, resulting in a drop in the tank level, which can be detected using the tank level sensor.