Abstract: An accelerator pump cap for an accelerator pump assembly of a carburetor, such as a motorcycle or ATV carburetor, has a cap body with a base and a sidewall projecting from the base defining a fuel chamber within the cap body beneath an open top. Preferably, one or more ports extend through the sidewall closely-spaced to the open top of the cap body to ensure that any vapor or gas residing within the fuel chamber is flushed out of the fuel chamber through the port or ports when the accelerator pump assembly is actuated to supply fuel to the carburetor. Accelerator pump assemblies and the use of a separate collector ring within an accelerator pump cap are also provided.

Abstract: An accelerator pump cap for an accelerator pump assembly of a carburetor, such as a motorcycle or ATV carburetor, has a cap body with a base and a sidewall projecting from the base defining a fuel chamber within the cap body beneath an open top. Preferably, one or more ports extend through the sidewall closely-spaced to the open top of the cap body to ensure that any vapor or gas residing within the fuel chamber is flushed out of the fuel chamber through the port or ports when the accelerator pump assembly is actuated to supply fuel to the carburetor. Accelerator pump assemblies and the use of a separate collector ring within an accelerator pump cap are also provided.

Abstract: A carburetor atomizer including a cylindrical body with a central bore is disclosed. The body is arranged upstream of the venturi and throttle plate. The bore is oriented parallel to the flow axis of the carburetor. The body has one or more annular conduits circumferentially arranged around the bore, each conduit communicating with the bore through a respective plurality of circumferentially spaced ducts, which can be radially or tangentially oriented relatively to the bore. Respective feeder tubes supply at least one annular conduit with fuel which is drawn into the bore through the ducts where the fuel is broken-up into droplets and mixed with air flowing through the carburetor and bore. Metered air is injected into the bore through a second annular conduit and plurality of ducts which promotes further atomization of the fuel and mixing of the fuel-air mixture in the bore.