Fuel supply device for a diesel engine

The system has a fuel tank, a fuel pump, at least one fuel filter and a heater for fuel fed to an injection system. Excess/leakage fuel is fed back to the fuel tank via a return line. A relatively high throughput, controllable electrical in-tank pump in the fuel tank feeds fuel to an injection system pump via a pressure-dependent filter arrangement. Fuel fed back to the fuel tank via the return line is fed to the induction side of the in-tank pump. The system has a fuel tank (3), a fuel pump (30), at least one fuel filter (4,5) and a heater (6) for fuel fed to an injection system (7). Excess and/or leakage fuel is fed back to the fuel tank via a return line (8). A relatively high throughput, controllable electrical in-tank pump (30) in the fuel tank feeds fuel to a pump (9) in the injection system via a pressure-dependent filter arrangement (10). Fuel fed back to the fuel tank via the return line is fed to the induction side of the in-tank pump.