Patent ID: 8171916

Claim:
A fuel supply system comprising: a fuel tank for storing fuel; a fuel pump supplying the fuel in the fuel tank to an engine; a pressure regulator having a pressure regulating chamber and a control pressure chamber divided by a movable partition, adjusting fuel pressure in the pressure regulation chamber depending on pressure in the control pressure chamber, and discharging redundant fuel in the pressure regulation chamber, wherein the fuel introduced into the pressure regulation chamber is the pressurized fuel after pressurization due to the fuel pump, and wherein the fuel introduced into the control pressure chamber is the fuel after pressurization or being pressurized due to the fuel pump; a control device; a changeover valve disposed in a valve chamber and selectively switching between an introduction of fuel and an introduction of air to the control pressure chamber of the pressure regulator depending on control by the control device; and a passage forming member forming a control pressure passage for feeding the fuel to the control pressure chamber of the pressure regulator and the valve chamber for the changeover valve.