| 摘要 |
A push button air primer is provided for a carburetor used with a small internal combustion engine. The carburetor includes a primer chamber having a piston scalingly and slidably movable therein, with a return spring biasing the piston outwardly of the carburetor. The piston is depressible by an operator such that, upon initial depression of the piston, a portion of the piston slides past a plurality of vent holes in the wall of the primer chamber to block communication between the primer chamber and an internal vent passage within the carburetor which leads to the carburetor throat and thence to the atmosphere. Thereafter, further depression of the piston reduces the volume of the primer chamber and forces a quantity of air from the primer chamber into the fuel bowl of the carburetor, thereby pressurizing the air space in the carburetor to force a quantity of liquid fuel into the throat of the carburetor to aid in engine starting.
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