Patent ID: 8544449

Claim:
A fuel feeding device for feeding fuel from a fuel tank to a multi-fuel engine operated by using fuel in which alcohol and gasoline are mixed at an arbitrary ratio, the fuel feeding device comprising: a fuel pressure governor for maintaining pressure of the fuel from the fuel tank at a constant pressure; a fuel injection device for injecting the fuel to the engine; a connecting line for connecting the fuel pressure governor and the fuel injection device, the connecting line having a predetermined internal volume; an oxygen sensor for measuring an amount of oxygen included in exhaust gas of the engine; and a control unit for estimating a concentration of the alcohol in the fuel on the basis of the measured value of oxygen sensed by the oxygen sensor, and for controlling the fuel injection rate, wherein the predetermined internal volume of the connecting line is a volume equal to or greater than an amount of fuel estimated to be sufficient to supply the engine during a warm-up period lasting from an initial cold startup of the engine until the oxygen sensor reaches a measurement-enabling temperature under a set of predetermined operating conditions.