Fuel-conveying system for use in a vehicle

A fuel-conveying system for use in a vehicle having an internal combustion engine and a fuel tank (4) having a first region (4a) and a second region (4b), the fuel-conveying system comprising:

• at least one primary fuel pump (10), configured to supply fuel to the internal combustion engine, at a fuel pressure;
• at least one suction jet pump (14, 16) configured to convey the fuel from the first region (4a) of the fuel tank (4) to the second region (4b) of the fuel tank (4), the at least one suction jet pump (14, 16) having a nozzle (15, 17);
• at least one secondary fuel pump (12), decoupled from the at least one primary fuel pump (10) and configured to:
• supply, as required, the at least one suction jet pump (14, 16) with a fuel jet, and
• set, independently of the at least one primary fuel pump (10), a pressure of the fuel jet before the nozzle (15, 17) of the at least one suction jet pump (14, 16);
• and
• a check valve (28), arranged downstream of the at least one secondary fuel pump (12), the check valve (28) being configured to decouple a hydraulic conveying circuit of the at least one secondary fuel pump (12) from a conveying path of the at least one primary fuel pump (10) and via which the at least one secondary fuel pump (12) is switchable in, in a manner supporting the at least one primary fuel pump (10),
• wherein the at least one primary fuel pump (10) is, in comparison with the at least one secondary fuel pump (12), dimensioned so as to be less powerful than the at least one secondary fuel pump (12) and is configured for a part-load range of the internal combustion engine, wherein, in the full-load range of the internal combustion engine, the more powerful at least one secondary fuel pump (12) is switchable in via the check valve (28) to the conveying path to provide support to the less powerful at least one primary fuel pump (10).