Patent ID: 7343901

Claim:
A fuel supply device for pressure accumulation fuel injection system including a common rail that accumulates high-pressure fuel and an injector that injects the high-pressure fuel supplied by the common rail into a cylinder of an internal combustion engine, the fuel supply device supplying the high-pressure fuel to the common rail, and comprising: a high-pressure pump that pressurizes fuel and pressure-feeds fuel to the common rail; a feed pump driven by the engine to draw fuel from a fuel tank and to supply fuel to the high-pressure pump; a suction quantity control valve located downstream of the feed pump to control a quantity of fuel supplied from the feed pump to the high-pressure pump; a fuel filter located between the feed pump and the suction quantity control valve to filter fuel discharged by the feed pump; a flow rate restricting device located upstream of the suction quantity control valve to restrict a flow rate of fuel passing through the fuel filter; and a relief valve located between the feed pump and the fuel filter, wherein the relief valve opens to release fuel pressure acting on the fuel filter if fuel pressure acting on the fuel filter exceeds a predetermined value.