OIL FEEDER

PROBLEM TO BE SOLVED: To shorten the time until the judgement for the kind of oil is made while preventing the suction of fuel oil. SOLUTION: A liquid sensor 8 is provided on the tip of a nozzle cylinder end section 2, and the air suction and exhaust operation of an air pump 29 is controlled by signals issued from the liquid sensor 8. When an oil feed nozzle is inserted into an oil feed opening, the judgement for the kind of fuel oil is made up by sucking from a vapor suction and exhaust opening 5 to a gas sensor 26 provided on the oil feed nozzle by the arrangement, and in the case liquid is sensed by the tip of the nozzle cylinder end section 2, a positive pressure is applied by the air pump 29 to prevent the infiltration of the fuel oil into the gas sensor 26.