FUEL SUPPLYING SYSTEM FOR SUPPLYING FUEL TO INTERNAL COMBUSTION ENGINE BY FUEL FORCIBLY FEEDING MODULE OF DEMAND QUANTITY CONTROL TYPE

摘要

PURPOSE: A fuel supplying system for supplying fuel to internal combustion engine by fuel forcibly feeding module of demand quantity control type are provided to suppress generation of steam bubbles in a fuel supplying system in the warming start by closing a return conduit supplied from an approach route by a switchable adjusting unit, and regulating a return quantity to the minimum demand quantity or more with all operating pressure by a throttle element. CONSTITUTION: An adjusting unit(10) for switching at a branch point of a conduit(11) for returning fuel to a reservoir tank(7), is arranged in a delivery conduit(13) for supplying fuel to a high pressure part of a fuel supplying system(1). The regulating unit(10) is constituted as a close surface wherein a throttle element(10.1) having a constant cross section is arranged, and is connected to a controller(20) through an operation control leading wire(17). The throttle cross section of the throttle element(10.1) is designed in such a constitution that it is guaranteed to supply fuel which is sufficiently for filling a pot of an electrically driven fuel pump by a pump disposed in the reservoir tank(7) even if system pressure is the minimum during operation.