| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel pump unit capable of minimizing influence of change of a fuel composition on fuel injection control, and being miniaturized to be easily mounted.SOLUTION: A fuel pump unit includes a case, a partitioning portion, a suction port, and a fuel pump. The case includes a discharge port for discharging fuel, and a return port for returning excess fuel. The partitioning portion divides an internal space of the case into a return fuel chamber and a main fuel chamber. The return fuel chamber is provided with a return port. The main fuel chamber is communicated with the external of the case. The suction port is disposed in the return fuel chamber. The fuel pump sucks fuel from the suction port and discharges the same from the discharge port. |
