Patent ID: 7007675
Filing Date: 2006-03-07
Classification: F02M,Y10T

Abstract:
1. A fuel supply system for an internal combustion engine, comprising: a saddle type fuel tank provided with a main chamber and an auxiliary chamber on both sides of an upwardly protruding center portion of a bottom face thereof; a fuel return pipe returning fuel from an engine body to said fuel tank; a jet pump having a function for pumping the fuel to a main chamber side of said fuel tank by utilizing a negative pressure occurring due to a fuel ejection pressure from an outlet of said fuel return pipe; and a fuel transfer tube with one end portion connected to a fuel introduction port of said jet pump and the other end portion mounted to lie over said protruding portion, to face said auxiliary chamber, wherein at least a part of said fuel transfer tube is formed by arranging alternately a plurality of bellows portions each of which cross section is variable, and a plurality of straight portions each of which cross section is fixed, each of adjacent bellows portions having only one of the straight portions therebetween, and wherein a straight portion disposed downstream of one bellows portion has a length equal to or more than a length of the one bellows portion disposed upstream of the straight portion; and wherein said fuel transfer tube is configured to be formed by in bellows shape at a portion thereof, said fuel transfer tube being variable in accordance with the shape of the fuel tank.