Fuel air delivery circuit with enhanced response, fuel vaporization and recharge

A jet for an air fuel mixing device, comprising:

• a body having an elongate fuel passage of a predetermined sectional extent therethrough configured for delivering a metered flow of fuel to an enclosed intake path of the air fuel mixing device, the body being configured and sized to be cooperatively received in a passage of the air fuel mixing device extending from a cavity for holding a quantity of fuel, and the enclosed intake path, the body having an external surface which when the body is located in the passage of the air fuel mixing device, with a surface bounding the passage of the air fuel mixing device, will bound and define an enclosed cavity extending at least partially about the body along a portion of a length thereof;
• an inlet opening at a first end of the body connecting to the fuel passage and configured and disposed to connect with the cavity for holding the quantity of fuel, and an outlet opening connecting to the fuel passage at a second end of the body and configured to connect with the enclosed intake path of the device so as to be exposed to a flow of air therethrough;
• the body having a plurality of vector passages extending therethrough at spaced locations along the portion of the length thereof, from the exterior surface to the fuel passage in intersecting relation thereto, and at least one vector passage extending through the body from the exterior surface to the fuel passage in intersecting relation thereto at a location along the length of the body between the portion of the length thereof and the outlet opening, disposed to connect directly to an air flow passage extending through the air fuel mixing device separately from the enclosed intake passage and connecting to an air source, and wherein at least some of the vector passages are oriented at an acute angle to the longitudinal direction of the fuel passage.

A needle jet for a carburetor, comprising:

• a body having an elongate needle passage therethrough configured for receiving a needle of the carburetor for longitudinal movement therein, the body being configured and sized to be cooperatively received in a passage of the carburetor extending from a cavity for holding a quantity of fuel, to a main intake passage of the carburetor for flow of an air-fuel mixture to an engine with which the carburetor is used, the body having an external surface which when the body is located in the passage of the carburetor extending from the cavity for holding a quantity of fuel to the main intake passage, will bound and define a cavity extending at least partially about a predetermined portion of a length of the body;
• an inlet opening at a first end of the body connecting to the needle passage and configured and disposed to connect with the cavity for holding the quantity of fuel, and an outlet opening connecting to the needle passage at a second end of the body and configured to connect with the main intake passage of the carburetor so as to be exposed to a flow of air therethrough;
• the body having a plurality of vector passages extending therethrough at spaced locations along the predetermined portion of the length thereof, from the exterior surface to the needle passage in intersecting relation thereto, and at least one vector passage extending through the body at a location between the predetermined portion of the length thereof and the outlet opening, connected to the needle passage and disposed to connect directly to an air flow passage extending through the carburetor separately from the main intake passage and connecting to an air source, and wherein at least some of the vector passages are oriented at a small acute angle to the longitudinal direction of the needle jet so as to extend at an acute angle toward the outlet opening.