Patent ID: 6047684
Filing Date: 2000-04-11
Classification: F02M

Abstract:
A fuel system for a vehicle engine in which fuel is injected and combusted by a spark ignition, said fuel system comprising:a fuel injection nozzle for injecting fuel;a gear pump including gears and a seal member for sealing up teeth of the gears engaging with each other in a sealed-up gear case, which seal member is provided at a place occupied by at most two teeth in the vicinity of a working area of said teeth in a low pressure side of the gear pump and is not connected to said gear case, said seal member having a low pressure fuel flowing hole for the flow of a low pressure fuel, wherein a tooth sealing angle for said at most two teeth is set substantially to a value within a range of 35.degree..+-.5.degree. for gears having 14 to 18 teeth, and a high pressure fuel flowing passage for the flow of a high pressure fuel, formed in a space other than said working area and the area of said sealing member, in said gear case;a fuel tank;a pipe connecting said fuel tank and said low pressure fuel flowing hole; anda pipe connecting said fuel injection nozzle and said high pressure fuel flowing passage.