Patent ID: 7383811

Claim:
A fuel injection system for an engine, comprising: a downstream-side fuel injection valve disposed in an intake passage connected to a combustion chamber of the engine, injecting fuel therein; an upstream-side fuel injection valve disposed in the intake passage, upstream of said downstream-side fuel injection valve, injecting fuel into the intake passage; and a fuel pump for supplying the fuel under pressure to the downstream-side fuel injection valve and the upstream-side fuel injection valve is provided in the fuel injection system, wherein a fuel injection pressure applied to said upstream-side fuel injection valve is set at a higher value than a fuel injection pressure applied to said downstream-side fuel injection valve; and wherein the fuel pump comprises a first fuel pump which supplies the fuel in a fuel tank under pressure to the downstream-side fuel injection valves; and a second fuel pump which supplies the fuel via the first fuel pump under pressure to the upstream-side fuel injection valve.