The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 1989
Filed:
Jul. 11, 1988
James K Miller, Cass City, MI (US);
Walbro Corporation, Cass City, MI (US);
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. An manual pump has an inlet coupled by a fuel line through the carburetor reservoir to a fuel supply, and an outlet connected by the fuel line to a constant flow rate nozzle orifice positioned at the carburetor air intake. A pressure switch is connected in the fuel line between the pump and orifice and provides a signal, in the form of a switch closure, to priming control circuitry whenever fuel, as distinguished from air, is pumped through the orifice to the carburetor air intake. The control circuitry receives battery power through the pressure switch contacts, and includes an integrator for accumulating total time of fuel flow and thereby indirectly indicating the total quantity of priming fuel supplied through the constant-flow orifice. When the integrated time duration exceeds a selected threshold, an LED is driven by an oscillator to advise the operator to terminate the manual priming operation. Most preferably, the time-duration threshold is varied as a function of engine temperature.