| 摘要 |
PURPOSE:To simplify fuel supply system in fumigation by connecting a return pipe returning fuel from a main fuel injection valve to a fuel tank to a sub fuel injection valve and opening the sub fuel injection valve according to running condition of an engine. CONSTITUTION:Fuel sucked from a tank 11 to a pump 14 is pressurized to be fed to a main fuel injection valve 16 through a pipe 15, and injected to respective combustion chambers. In this time, the remaining fuel is returned to the tank 11 through a return pipe 17. A sub fuel injection valve 18 is provided on the way of the return pipe 17 so that it can inject the fuel fed into an intake manifold 19. While, the sub fuel injection valve 18 is connected to a computer 21, and a signal 22 of an engine rotational speed and a signal 23 of an engine load are input in the computer 21. Thus, a valve opening signal is fed to the sub fuel injection valve 18 for a predetermined time when the engine is in high load and middle and high rotation range.
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