Patent ID: 7331328

Claim:
A control device of a fuel system of an internal combustion engine including a low-pressure pump supplying fuel from a fuel tank to a fuel injection mechanism and a high-pressure pump provided between said low-pressure pump and said fuel injection mechanism and increasing pressure of the supplied fuel, comprising: a detection portion detecting that an operation state of said internal combustion engine is an idle operation state; a fuel state detection portion detecting a state of fuel in a pipe connecting said high-pressure pump and said fuel injection mechanism, said fuel state detection portion detecting a state of vaporization of the fuel in said pipe; and a control portion controlling said low-pressure pump and said high-pressure pump, said control portion controlling said high-pressure pump and said low-pressure pump such that, when said idle operation state is detected, pressure of the fuel discharged from said high-pressure pump and pressure of the fuel discharged from said low-pressure pump are adjusted based on the state of the fuel in said pipe.