Carburetor start pump circuit
AssigneeU.S.A. Zama, Inc.
InventorScott R. Shaw
Life of this patent
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Abstract
A carburetor start pump circuit, for starting an engine, has an auxiliary fuel pump mounted on a relatively standard carburetor body, a pulse passageway extending through the carburetor body to the auxiliary fuel pump, and a fuel circuit having an intake side extending from a metering chamber in the carburetor body to the auxiliary pump where it is interconnected to a discharge side extending from the auxiliary pump to a throttle bore in the air intake of the carburetor body. To facilitate control of fuel flow, the fuel circuit includes inlet and discharge check valves and a metering jet.
Claims28
A carburetor comprising
- a body,
- a first fuel pump mounted on said body,
- a starter circuit including
- a second fuel pump mounted on said body, and
- a first pulse passageway extending through said body to said second fuel pump.
A carburetor comprising
- a body,
- a start circuit including
- a fuel pump mounted on said body and driven by a pulse from an engine's crankcase during start-up of an engine,
- a pulse passageway extending through said body to said fuel pump,
- a first fuel passageway operably interconnecting said fuel pump to a metering chamber in said body, and
- a second fuel passageway operably interconnecting said fuel pump to a throttle bore in said body.
A carburetor comprising
- a body,
- a first fuel pump mounted on said body, and
- a second fuel pump mounted on said body, said second fuel pump being operably interconnected to an engine's crankcase during engine start-up when said body is mounted to an engine.
A method of enriching the air-fuel mixture in a carburetor mounted to an engine during start-up of the engine comprising the steps of
- transmitting a pulse from an engine's crankcase to an auxiliary fuel pump mounted on a carburetor body,
- drawing fuel from a metering chamber in the carburetor body into a pumping chamber of the auxiliary fuel pump,
- discharging the fuel in the pumping chamber in the auxiliary fuel pump into a throttle bore in the carburetor body, and
- terminating the transmission of the pulse from the engine's crankcase after the engine has reached a desired operating temperature.
Dependencies are inferred from the claim text.