Carburetor fuel supply system
AssigneeWalbro Engine Management, L.L.C.
InventorDale P. Kus
Life of this patent
Estimating the term…
Abstract
In at least some implementations a carburetor may include a main bore through which a fuel and air mixture is delivered from the carburetor, a fuel metering assembly, a supplemental fuel pump and a valve. The supplemental fuel pump includes a diaphragm that defines a fuel chamber on one side from which fuel may be discharged to at least temporarily increase the amount of fuel discharged from the carburetor and a reference chamber on the other side that is communicated with a reference pressure source. The valve is electrically actuated and moveable between first and second positions to at least substantially prevent communication of the reference pressure source with the supplemental fuel pump diaphragm when the valve is in its second position to thereby inhibit or prevent fuel being discharged from the fuel chamber.
Claims15
A carburetor, comprising:
- a main bore through which a fuel and air mixture is delivered from the carburetor;
- a fuel metering assembly from which fuel is provided to the main bore;
- a main fuel pump supplying fuel to the fuel metering assembly;
- a separate supplemental fuel pump including a supplemental diaphragm that defines a fuel chamber on one side from which supplemental fuel may be discharged to at least temporarily increase the amount of fuel discharged from the carburetor and a reference chamber on the other side that is communicable with a reference pressure source;
- and
- an electrically actuated control valve that is movable between a first position communicating the reference pressure source with the reference chamber to cause the fuel chamber to discharge supplemental fuel to increase the amount of fuel discharged from the carburetor and a second position to at least substantially prevent communication of the reference pressure source with the supplemental fuel pump diaphragm when the control valve is in its second position to thereby inhibit or prevent supplemental fuel from being discharged from the fuel chamber.
A carburetor, comprising:
- a main bore through which a fuel and air mixture is delivered from the carburetor;
- a fuel metering assembly from which fuel is provided to the main bore;
- a supplemental fuel pump including a diaphragm that defines a fuel chamber on one side from which fuel may be discharged to at least temporarily increase the amount of fuel discharged from the carburetor and a reference chamber on the other side that is communicated with a reference pressure source;
- an electrically actuated control valve that is movable between first and second positions to at least substantially prevent communication of the reference pressure source with the supplemental fuel pump diaphragm when the control valve is in its second position to thereby inhibit or prevent fuel being discharged from the fuel chamber;
- a main fuel pump assembly from which fuel is supplied to the fuel metering assembly and is separate from the supplemental fuel pump;
- and
- the main fuel pump assembly includes a main fuel pump diaphragm and said main fuel pump diaphragm and said supplemental fuel pump diaphragm are different portions of the same diaphragm body.
Dependencies are inferred from the claim text.