Patent ID: 8276568
Filing Date: 2012-10-02
Classification: F02D,F02M

Abstract:
1. A fuel supply apparatus comprising: a fuel tank; a fuel pump located within the fuel tank and connected to an injector of an engine; a tank-outside fuel supply pipe disposed externally of the fuel tank; a pressure adjusting mechanism constructed to adjust a pressure of a fuel discharged from the fuel pump, so that the fuel adjusted in pressure by the pressure adjusting mechanism is supplied to the injector via the tank-outside fuel supply pipe; wherein the pressure adjusting mechanism comprises: a control pressure chamber; a fuel passage capable of introducing the fuel, which is pressurized by the fuel pump but is not supplied to the injector, into the control pressure chamber and returning the fuel flowing out of the control pressure chamber into the fuel tank, a passage resistance adjusting device disposed on a downstream side of the control pressure chamber, and constructed to adjust a passage resistance against flow of the fuel through the fuel passage; and a fuel pressure adjusting chamber communicating with the tank-outside fuel supply pipe; wherein the passage resistance adjusting device is operable to set the fuel pressure within the fuel pressure adjusting chamber according to the pressure within the control pressure chamber, so that the pressure within the fuel pressure adjusting chamber can be increased to set a high pressure value for the fuel pressure within the tank-outside fuel supply pipe wherein the fuel discharged from a discharge hole formed along a pump passage of the fuel pump is introduced into the control pressure chamber via the fuel passage.