Patent ID: 7263972

Claim:
A fuel supply system for an internal combustion engine, comprising: a fuel tank for storing a fuel; a first fuel pump actuated in response to an operation instruction associated with an operation period of said internal combustion engine and for discharging the fuel in said fuel tank at a first pressure; a first fuel delivery pipe formed as a tubular body having first fuel injection means and for receiving the fuel discharged from said first fuel pump at an upstream side and delivering the fuel to said first fuel injection means such that the fuel is injected into said internal combustion engine; a second fuel pump connected in series with said first fuel delivery pipe, actuated during operation of said internal combustion engine, and for applying pressure to the fuel received from a downstream side of said first fuel delivery pipe to discharge the fuel at a second pressure; a second fuel delivery pipe formed as a tubular body and connected in series with said first delivery pipe, said second pipe having a second fuel injection means and for receiving the fuel discharged from said second fuel pump at an upstream side and delivering the fuel to said second fuel injection means such that the fuel is injected into said internal combustion engine; a pressure regulation unit provided on a fuel path between said first fuel delivery pipe and said second fuel pump and for guiding the fuel in the fuel path to a pressure release path when a pressure of the fuel in the fuel path exceeds said first pressure; and pressure release means provided between the fuel path downstream of said second fuel pump and said pressure release path, actuated at the stop of operation of a vehicle, and for guiding the fuel in the fuel path to said pressure release path.