Patent ID: 6910464

Claim:
A fuel supply system for a vehicle comprising: a fuel pump for pumping fuel in a fuel tank to a fuel injection valve via a fuel piping including a check valve; a fuel pressure regulator for controlling the fuel pressure in the fuel piping to a predetermined control pressure; a pressure detector for measuring the fuel pressure in the fuel piping; and pump control means for controlling or stopping the operation of the fuel pump by setting a DUTY drive signal supplied to the fuel pump control device to a predetermined DUTY when the output of the pressure detector reaches a first set pressure P 1 and setting a DUTY drive signal supplied to the fuel pump control device to a DUTY according to the required amount of fuel discharge when the output of the pressure detector is lowered to a second set pressure P 2 which is lower than the first set pressure P 1 and the predetermined control pressure of the fuel pressure regulator, so that the fuel pump is driven by a given discharge amount.