Accelerator pump cap for a motorcycle carburetor
OwnerEdward A. Brazinainventor
Life of this patent
Estimating the term…
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.
Claims20
A carburetor having an accelerator pump assembly, comprising:
- a carburetor body having an induction passage;
- a fuel bowl mounted on a bottom of said carburetor body;
- an accelerator pump cap mounted exteriorly on an underside of said fuel bowl with fasteners and being removable therefrom without requiring disassembly of said carburetor body and fuel bowl, said cap having a recess defined by a base, a sidewall and an open upper end of said cap;
- a diaphragm mounted on said upper end of said cap and being deflectable downward within said recess;
- and
- a fuel chamber located within said cap underneath said diaphragm and defined by said base, sidewall and underside of said diaphragm, said fuel chamber communicating only to a pair of pathways that each extend within the sidewall of said cap to openings on an upper surface of said cap, said pathways including a first fuel supply conduit providing the only path for fuel from said fuel bowl into said fuel chamber and a second fuel supply conduit providing the only path for fuel from said fuel chamber to said induction passage;
- said cap having at least one fixed, stationary port formed in said sidewall adjacent said upper end of said cap to ensure that any vapor, including fuel vapor, air and water vapor, within said chamber is flushed through said at least one port when said diaphragm is deflected downward into said cap.
An accelerator pump cap for an accelerator pump assembly of a carburetor, comprising:
- a cap body having a base and a sidewall projecting from said base defining a fuel chamber within said cap body beneath an open top in which a diaphragm of the accelerator pump assembly is receivable, said cap body being mountable exteriorly to an underside of a fuel bowl of the carburetor with fasteners and being removable therefrom without requiring disassembly of the carburetor;
- a pair of pathways each extending within the sidewall of said cap to openings on an upper surface of said cap, one of said pathways forming at least a part of a first fuel supply conduit providing the only path for fuel from the fuel bowl into said fuel chamber, and the other of said pathways forming at least a part of a second fuel supply conduit providing the only path for fuel from said fuel chamber to an induction passage of the carburetor;
- and
- at least one fixed, stationary port extending through said sidewall closely-spaced to said open top of said cap body in constant communication with said fuel chamber to ensure that any gas or vapor within said fuel chamber is flushed out of said fuel chamber and through said at least one port into one of said pair of pathways each time said accelerator pump assembly is actuated.
For use with a carburetor having a fuel bowl with a wall forming a cavity with at least one port and a diaphragm moveable in the fuel bowl, a collector ring adapted to be installed in the fuel bowl to form with the wall of the fuel bowl a chamber for receiving liquid fuel, said collector ring having at least one aperture providing communication between the chamber and the cavity, said aperture being located closely adjacent the diaphragm when said collector ring is operatively installed in the fuel bowl, whereby displacement of the diaphragm into the fuel bowl causes unwanted gas to be displaced from the cavity and through the at least one port.
Dependencies are inferred from the claim text.