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:
Jan. 11, 2000
Filed:
Apr. 21, 1995
Charles H Tuckey, Cass City, MI (US);
Walbro Corporation, Cass City, MI (US);
Abstract
A main fuel tank in an automotive vehicle contains a reservoir in which is located a two-stage electrically operated pump. The first stage is a rotary side lateral pump which draws fuel from the main tank and delivers it to the reservoir. The second stage is a rotary turbine pump which draws fuel from the reservoir and delivers it to the vehicle engine. The reservoir has overflow restriction means which allows air to vent while the reservoir is filling with fuel but which restricts fuel flow when the reservoir is full. This creates pressure in the reservoir to create back pressure against and shut down fuel flow from the first stage pump and also increase pressure on the fuel inlet of the second stage pump thus increasing the efficiency of the second stage fuel pump.