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Fuel guage

Posted: Thu Feb 28, 2019 8:03 pm
by Sonarman
My fuel guage works fairly good but when I put the headlight switch to on it pegs full. Do you think I have a ground problem? Guage shows 3/4 when the tank of full. I can live with that.
Thanks in advance.

Re: Fuel guage

Posted: Thu Feb 28, 2019 9:41 pm
by rmel
The Fuel gauge is basically an Ammeter, the more current the higher the reading.
The fuel sender is a variable resistor, Full is approximately 10 Ohms, Empty about 180 Ohms.
So first off, if your reading 3/4 when full check your ground connections. The ground at the
top of the tank is typically a weak spot. The 4 screws at the top of Fuel sender can loose
compression as the cork seal shrinks thus creating a poor contact and higher resistance
resulting in lower meter readings.