Page 198 - Methods For Monitoring And Diagnosing The Efficiency Of Catalytic Converters A Patent - oriented Survey

180 Methods for Monitoring and Diagnosing the Efficiency of Catalytic Converters

fourth cylinders, and an exhaust collecting portion to which the first to fourth branch exhaust
gas portions are collected.

Fig. 81 (from US5379587)

A fuel injection valve connects to each cylinder, and communicates with a fuel tank by a fuel
supply passage through a fuel distributing passage. The fuel is fed by a fuel pump through a
fuel filter. The passage distributes and supplies the fuel to the first to fourth fuel injection
valves.

A &el pressure adjusting section adjusts the pressure of fuel that is provided by the fuel
distributing passage. The fuel pressure adjusting section adjusts the fuel pressure to a
predetermined value by an intake pressure which is led from a connecting passage which
communicates with the intake passage. The remaining surplus fuel is returned to the &el tank
by a fuel return passage.