Fuel injection system having electric low-pressure pump

Controlling means (6) of a fuel injection system (1) regulates an energization amount of an electric motor (3) in accordance with a sensing signal outputted from common rail pressure sensing means (8). Thus, the controlling means (6) controls a fuel supply quantity of a low-pressure pump (5). Thus, power consumption of the electric motor (3) driving the low-pressure pump (5) can be regulated in accordance with a pressure-feeding quantity of a high-pressure pump (2). As a result, the power consumption of the electric motor (3) can be reduced and wasteful fuel supply of the low-pressure pump (5) can be reduced.