Importance

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Abstract

In a charge forming apparatus comprising fuel supply means including an idling orifice and a low speed orifice for feeding the amount of fuel required during the period that an engine is idling or running at a low r.p.m. and a supplemental fuel passage for guiding the fuel to such orifices and an air feeding bypass for keeping the engine idling, the supplemental fuel passage is connected to a portion of the bypass upstream of a manually operable valve for regulating the flow rate of air by means of a connecting path. A negative pressure generated on the engine side rather than on a throttle valve makes negative the supplemental fuel passage and the bypass, but a negative pressure on the upstream side of a valve of the bypass varies in correspondence with the effective path area varied by the valve. Depending upon a difference in negative pressure between the upstream of the valve of the bypass and the supplemental fuel passage, a part of air flows into the supplemental fuel passage, or a part of fuel flows in the bypass, causing the fuel for idling to vary in primary proportion to the amount of air fed through the bypass, thereby keeping the air/fuel rate of a mixture constant all the time.

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First Claim