Method and system for determining level of fuel

Details Method and system for determining level of fuel Method and system for determining level of fuel

2008-03-18

2008-03-18

Larkin, Daniel S. (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Hydrostatic pressure type

C073S29000R

Reexamination Certificate

active

11182176

ABSTRACT:
A method and system for determining the level of fuel contained in the tank of a motor vehicle includes a fuel pump disposed in the tank for creating a flow of fuel in the tank. An elongated tube is placed vertically in the tank. The system also includes a venturi tube coupled between the fuel pump and the elongated tube for creating a vacuum as a result of a portion of the flow of fuel therethrough from the fuel pump thereby drawing fuel vapor from the elongated tube at a varying pressure, the pressure decreasing as the amount of fuel vapor in the tank increases. A controller is coupled to the elongated tube for determining the level of fuel in the tank based on the pressure.

REFERENCES:
patent: 1905172 (1933-04-01), Howse
patent: 6679226 (2004-01-01), Burke et al.
patent: 6931926 (2005-08-01), Van Ee
patent: 6941808 (2005-09-01), Gouzou et al.
patent: 2004/0215407 (2004-10-01), Thielman et al.
patent: 2005/0189275 (2005-09-01), Stewart
patent: 2006/0231079 (2006-10-01), Paluszewski
patent: 4112559 (1992-10-01), None

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