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ravikiran Posted - Oct 23 2006 : 08:58:42 AM
Hi All,

i want to design a digital fuel gague for my car.
pls mail me if u have any ideas.
also i tried measuring the out put voltage of fuel gauge output by pouring 4 liters of petrol but the voltage was constant at 3.5 volts.

pls send me the working of the fuel gauge, if its current or voltage based.

Thank you.
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Aaron Cake Posted - Oct 23 2006 : 10:17:06 AM
Most fuel senders are a variable resistor connected to the gauge at one end, and ground at the other. The resistance changes based on the fuel level in the tank (a float and a pot...). The other side of the gauge is connected to a reference voltage, usually slightly less then 12V or slightly less then 5V. So measuring at the gauge probably won't tell you anything.

A digital fuel gauge is just a voltmeter which replaces the stock gauge. Not hard to make, even cheaper to buy from any performance shop.

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