Cold-start engine priming and air purging system

Abstract

A fuel delivery system for purging air from the reservoir of a diaphragm carburetor on an internal combustion engine and for supplying priming fuel to the carburetor air intake. A pump is responsive to electrical signals from priming control circuitry to draw fuel through the carburetor reservoir and to fuel under pressure to a nozzle positioned at the carburetor air intake. The electronic control circuitry is responsive to an operator for initiating a priming operation and includes a temperature sensor coupled to the engine for controlling duration of the priming operation, and thus the quantity of engine priming fuel, as a function of engine temperature. A second timer is responsive to operator initiation of a priming operation for preventing regeneration of the priming control signal to the pump, and thereby preventing attempting repriming in the event of failure of the engine to start.

Dependencies are inferred from the claim text.