Patent ID: 6792920
Filing Date: 2004-09-21
Classification: F02D

Abstract:
A fuel injection apparatus for an engine comprising:a fuel pump for pumping fuel from a fuel tank to a fuel injection passage; an injector for injecting fuel from said fuel injection passage; and pressure regulating means disposed between the fuel injection passage and the fuel tank for regulating the fuel pressure in said fuel injection passage at a constant value; wherein said pressure regulating means includes a first pressure regulating valve and a second pressure regulating valve, said first pressure regulating valve and the second pressure regulating valve are connected at the entrances thereof to said fuel injection passage via a first and second orifice, respectively, said first pressure regulating valve and the second pressure regulating valve are connected at the exits thereof to said fuel tank, respectively, a first pressure sensor for detecting the fuel pressure applied on the downstream of said first orifice, and a second pressure sensor for detecting the fuel pressure applied on the downstream of said second orifice, and failure diagnostic means for notifying of the occurrence of the defective conditions by a predetermined display when the fuel pressures detected by said first pressure sensor and the second pressure sensor are different.