| 摘要 |
A fuel system includes a fuel pump (3) formed of a constant-volume pump for changing a discharge flow rate in conjunction with a variation in a speed of revolution of a drive shaft, a boost pump (4) disposed upstream from the fuel pump (3) and formed of a constant-volume pump of which a discharge flow rate per unit of revolution of a drive shaft is greater than that of the fuel pump (3), a single electric motor (5) rotationally driving the drive shaft of the fuel pump (3) and the drive shaft of the boost pump (4) in a state in which the speeds of revolution thereof are equal to each other, a return flow channel (7) connecting an upstream side and a downstream side of the boost pump (4), and a relief valve (8) disposed in the return flow channel (7) and opened when an internal pressure of the return flow channel (7) is greater than a reference pressure. |
