A fuel supply apparatus for a general purpose engine includes a carburetor provided in an air intake line extending from an air cleaner to the general purpose engine, a pressure reduction connection channel connected to a float chamber of the carburetor and the air cleaner, a control valve provided in the pressure reduction connection channel, a pressure reduction pump provided in the pressure reduction connection channel and sucking the float chamber to reduce the pressure therein, an air fuel ratio sensor detecting the air fuel ratio of an exhaust gas discharged from the general purpose engine, and a control unit controlling the opening degree of the control valve based on a detection signal of the air fuel ratio sensor.

A fuel supply apparatus for a general purpose engine includes a carburetor provided in an air intake line extending from an air cleaner to the general purpose engine, a pressure reduction connection channel connected to a float chamber of the carburetor and the air cleaner, a control valve provided in the pressure reduction connection channel, a pressure reduction pump provided in the pressure reduction connection channel and sucking the float chamber to reduce the pressure therein, an air fuel ratio sensor detecting the air fuel ratio of an exhaust gas discharged from the general purpose engine, and a control unit controlling the opening degree of the control valve based on a detection signal of the air fuel ratio sensor.

A fuel supply apparatus for a general purpose engine includes a carburetor provided in an air intake line extending from an air cleaner to the general purpose engine, a pressure reduction connection channel connected to a float chamber of the carburetor and the air cleaner, a control valve provided in the pressure reduction connection channel, a pressure reduction pump provided in the pressure reduction connection channel and sucking the float chamber to reduce the pressure therein, an air fuel ratio sensor detecting the air fuel ratio of an exhaust gas discharged from the general purpose engine, and a control unit controlling the opening degree of the control valve based on a detection signal of the air fuel ratio sensor.

A double-passage balance structure of a carburetor includes a carburetor body and a float chamber composed of the carburetor body and a housing; the carburetor body is provided with balance passages and a through cavity for the air to enter and mix with a fuel and for a mixture to be output, the balance passages include A and second balance passages, openings of the A and second balance passages in the float chamber are staggered in an axial direction and a radial direction of the cavity, and the opening of the first balance passage in the float chamber is higher than the opening of the second balance passage in the float chamber; and other ends of the A and second balance passages are both communicated with a converging passage provided in the carburetor body, and the converging passage is communicated with the atmosphere.

A double-passage balance structure of a carburetor includes a carburetor body and a float chamber composed of the carburetor body and a housing; the carburetor body is provided with balance passages and a through cavity for the air to enter and mix with a fuel and for a mixture to be output, the balance passages include A and second balance passages, openings of the A and second balance passages in the float chamber are staggered in an axial direction and a radial direction of the cavity, and the opening of the first balance passage in the float chamber is higher than the opening of the second balance passage in the float chamber; and other ends of the A and second balance passages are both communicated with a converging passage provided in the carburetor body, and the converging passage is communicated with the atmosphere.