Carburetor with accelerator

Abstract

A circuit for delivering fuel into a valve chamber of a rotary throttle valve type carburetor. The fuel delivery circuit includes a fuel supply nozzle, protruding into the valve chamber and fixed at the bottom of the valve chamber to the carburetor body, and an intermediate wall. The intermediate wall is connected to the bottom of the carburetor body. The intermediate wall has a first chamber defined therein, a second chamber defined therein, and structure which cooperatively defines a first passage and a second passage therein. The first passage communicates the first chamber to the fixed end of the fuel supply nozzle, and the second passage communicates the second chamber to the first chamber. In addition, the fuel delivery circuit also includes an enclosure having a pressurized fuel chamber disposed under the intermediate wall, wherein the intermediate wall cooperatively defines a third passage that communicates the pressurized fuel chamber to the second chamber. Furthermore, the fuel delivery circuit also includes a fuel jet, disposed along the first passage, and a check valve, disposed along the first passage between the fuel jet and the first chamber. In this way, the first passage, the first chamber, the second passage, the second chamber, and the third passage cooperatively define an elongated fuel passage between the pressurized fuel chamber and the fuel supply nozzle for delivering fuel into the valve chamber.