PURPOSE: To obtain a fuel measuring device for an evaporator which shows little temporal change of fuel measuring accuracy by means of a jet needle and a needle jet, and shows excellent fuel supply characteristics.
CONSTITUTION: A jet needle 40 has a columnar shape having substantially the same diameter as a fuel control hole 16, and has a recession 42 directed from an upper portion of an outer peripheral surface toward a lower end 43, a fuel flow passage 44 directed from an upper portion of an inner portion toward the lower end 43, and a fuel injection hole 45 formed from the fuel flow passage 44 toward the recession 42. The jet needle 40 is arranged on a sliding valve 7 with a floating condition, and extended downward from a lower bottom of the sliding valve 7. The jet needle 40 is movably arranged inside the fuel control hole 16 of a needle jet 40. A fuel control passage 46 is composed of the recession 42 of the jet needle 40 and the fuel control hole 16 of the needle jet 15.
ISHII TAKAO