Priming system for a vented bowl carburetor

摘要

A carburetor is provided with a primer for aiding in starting an engine, the primer including a priming bulb for forcing air into the air space in the float bowl to cause the air pressure in the air space to be greater than atmospheric pressure and to cause liquid fuel to be forced through the fuel nozzle and into said fuel-air mixture passage of the carburetor. The priming bulb includes a flexible wall having a groove and a vent opening is located in the base of the groove and is positioned so as to close as the priming bulb is compressed and as air is forced into the air space of the float bowl. The carburetor also includes a narrow passage permitting the venting of a portion of the air forced into the air space of the fuel bowl by the priming bulb to thereby control the amount of liquid fuel injected into the carburetor venturi.