Patent ID: 7431018

Claim:
A fuel injection system for an engine comprising: an accumulator in which fuel is to be accumulated at a target pressure for injecting the fuel into an engine; a high-pressure supply pump driven by an output of the engine to supply the fuel to said accumulator; a low-pressure supply pump driven by a power source other than the engine to suck the fuel from a fuel tank and supply the sucked fuel to said high-pressure supply pump through a fuel flow path; a pressure regulator disposed in the fuel flow path extending from said low-pressure supply pump to said high-pressure supply pump, said pressure regulator working to regulate a pressure of the fuel supplied from said low-pressure supply pump to said high-pressure supply pump; and an abnormal pressure detector working to monitor a preselected parameter that bears a correlation to fuel-held energy that is energy held by the fuel at an inlet of said high-pressure supply pump to detect whether a pressure of the fuel at the inlet of said high-pressure supply pump is in an abnormal level or not.