Abstract: A fuel supply system for a gasoline direct injection (GDI) engine may reduce noise caused by a high pulsation pressure generated in a high-pressure pump due to fuel pressure control. The fuel supply system may include: a high-pressure pump; a high-pressure rail; an injector that is installed at the high-pressure rail and injects a fuel into a combustion chamber of the GDI engine; and a high-pressure pipe that is connected between the high-pressure pump and the high-pressure rail so as to supply the fuel to the high-pressure rail, wherein a porous member for reducing a pulsation pressure through which a plurality of through holes through which the fuel to be supplied to the high-pressure rail passes, is formed, is installed on a flow passage of the high-pressure pipe.