Patent ID: 7506637
Filing Date: 2009-03-24
Classification: B01D,F02M

Abstract:
1. A fuel feed apparatus for pumping fuel from a fuel tank to a reservoir tank, which is configured to accumulate fuel to be injected from an injector, the fuel feed apparatus comprising: a fuel pump configured to pump fuel from the fuel tank to the reservoir tank through a fuel passage in accordance with pressure in the reservoir tank; a branch pipe that branches from the fuel passage to the fuel tank and defines therein a return passage; a relief valve provided to the branch pipe and configured to open the return passage when pressure in the return passage is equal to or greater than a predetermined pressure; and a throttle unit provided to the branch pipe upstream of the relief valve; a pressure detection unit configured to detect pressure in the reservoir tank; and a control unit configured to control the fuel pump so that the pressure in the reservoir tank as detected by the pressure detection unit is maintained at a predetermined pressure, wherein the return passage is reduced to be equal to or less than 0.8 mm