Patent ID: 7178506

Claim:
A fuel supply apparatus for an internal combustion engine, comprising: a first fuel injection mechanism injecting a fuel into an intake manifold; a second fuel injection mechanism injecting the fuel into a cylinder, wherein said first and second fuel injection mechanisms are provided for each cylinder of the engine; a first fuel supply system for applying pressure to the fuel by using a low-pressure pump and supplying the fuel to said first fuel injection mechanism; a second fuel supply system branched from the first fuel supply system for applying pressure to the fuel having been applied with pressure by said low-pressure pump by using a high-pressure pump of a metering delivery type driven in accordance with an operation state of the internal combustion engine and for supplying the pressurized fuel to said second fuel injection mechanism; control means for controlling said high-pressure pump to supply the pressurized fuel of a prescribed quantity irrespective of an actuation state of said second fuel injection mechanism; and a relief valve for externally discharging excessive fuel from said second fuel supply system.