To provide a fuel supply device eliminating piping relating to a back pressure introducing passage for introducing fuel into a back pressure chamber of a pressure regulator to improve response in change of system fuel pressure.
A fuel pump 18 supplies the fuel in a fuel tank 12 to an engine 14. The pressure regulator 38 has a pressure regulating chamber 44 and the back pressure chamber 45 defined by a movable partition wall 67, regulates fuel pressure in the pressure regulating chamber 44, in which part of the fuel boosted by the fuel pump 18 is introduced, according to pressure in the back pressure chamber 45, and discharges the surplus fuel in the pressure regulating chamber 44. A communication hole 70 connecting between the chambers 44, 45 is formed to the movable partition wall 67. Opening/closing means (40, 78) are provided to open/close a back pressure discharge passage 72 for discharging the fuel in the back pressure chamber 45. Opening or closing of the back pressure discharge passage 72 by the opening/closing means varies the system fuel pressure of the fuel supplied to the engine 14.
SUZUKI HIDEAKI
SUDA SUSUMU
TOKUDA KAZUYUKI
KOBAYASHI MASAHIDE
TOYOTA MOTOR CORP