PURPOSE: To obtain a fuel measuring device which shows high fuel measuring accuracy by means of a jet needle and a needle jet, little temporal change, and excellent durability.
CONSTITUTION: A jet needle 33 has an installation flange 35 on its upper side and a guide flange 36 on its lower side. A needle jet 18 opened to an intake passage 2 is continued to a mixing pipe 19 on which a fuel flow passage 19A is projected concentrically. The jet needle 33 is installed inside a through-hole 31 of a sliding valve 9 in a floating condition, through the installation flange 35. The guide flange 36 of the jet needle 33 is fitted in the fuel flow passage 19A of the mixing pipe 19 with a minute gap in a movable manner in a vertical direction and centering-supported in the fuel flow passage 19A in the mixing pipe 19. A measuring part of the jet needle 33 is centering-supported by means of the needle jet 18 in a non-contact condition. Fuel controlled by a fuel measuring gap formed by the measuring part and the needle jet 18 is supplied into the intake passage 2.
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