Patent ID: 7392700

Claim:
A system for determining the level of fuel contained in the tank of a motor vehicle comprising: a first resistive element disposed in the tank and having a first predetermined length L 1 , the first resistive element generating a variable resistance R V in response to electrical current and fuel passing therethrough; a second resistive element disposed in the tank and having a second predetermined length L 2 and a fixed resistance R 2 in response to the electrical current and fuel passing therethrough; and a microprocessor coupled to the first and second resistive elements for determining the level of fuel contained in the tank based on the variable resistance, the fixed resistance and the first and second predetermined lengths in accordance with the following equation: fuel % level={[( R D −R V ) L 2 ]/[( R D L 2 − R 2 L 1 )]}* 100% where R D is a predetermined known dry resistance of the first resistive element.