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:
Jul. 22, 1997
Filed:
May. 03, 1996
Timothy B Brandt, West Des Moines, IA (US);
Parr Manufacturing, Inc., Des Moines, IA (US);
Abstract
A combination fuel pressure regulator and fuel filter apparatus for vehicle fuel systems has a fuel supply tank with a fuel pump therein for pumping fuel to a fuel supply rail having fuel injectors attached thereto. A fuel filter is operably disposed between an inlet supply tube and a fluid outlet tube for filtering impurities from fuel passing therethrough. A valve in fluid communication with the inlet supply tube is provided with a regulator for causing flow to be short circuited back into the fuel supply tank when the pressure in the fluid outlet, compared to a reference pressure, exceeds a first predetermined level. The valve is biased to a closed position and will remain closed at one differential pressure of the clean side of the filter, compared to a reference pressure, whereby all of the fuel in the inlet supply tube will pass through the filter. The internal reference pressure is isolated so that it can be chosen to be from one of many sources at a different differential pressure between the predetermined pressure and the reference pressure, indicating that no more fuel is needed in the fuel rail, the valve will open to allow fuel to return to the fuel tank.