fuel gauge question
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fuel gauge question
im currently wiring up a set of aftermarket gauges (in another thread) and have a quick question, the fuel gauge im using is an electrical autometer 4315, with a sender range of 73 ohms empty and 10 ohms full. my problem is ive got the gauge wired up but as soon as you start up it reads full, even past the F and goes as far as it can ( its a 90 sweep) and i know for a fact i have only a gallon or two in the tank. am i correct that the ohm range is probably not correct and i cant use this gauge with a stock sending unit? if so what is the ohm range i need or can i just buy the 10-73 ohm sending unit and use that.
Race Director
Joined: May 2006
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From: Dayton, Ohio
im currently wiring up a set of aftermarket gauges (in another thread) and have a quick question, the fuel gauge im using is an electrical autometer 4315, with a sender range of 73 ohms empty and 10 ohms full. my problem is ive got the gauge wired up but as soon as you start up it reads full, even past the F and goes as far as it can ( its a 90 sweep) and i know for a fact i have only a gallon or two in the tank. am i correct that the ohm range is probably not correct and i cant use this gauge with a stock sending unit? if so what is the ohm range i need or can i just buy the 10-73 ohm sending unit and use that.
Thread Starter
Instructor
Joined: Nov 2011
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so did some looking and the wires all seem to be good, was backing the car out of my driveway and noticed something interesting, as i got onto the slant of my driveway the fuel gauge needle started swaying back and forth and as the gas stopped rolling around in the tank the needle would stop moving. so it is apparantly getting some sort of signal and the float may be working, my question is back to my ohms question, being that the stock fuel gauge was 0-90 ohms and the one i have installed now is 10-73. could this be the cause?
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Race Director
Joined: May 2006
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From: Dayton, Ohio
That's why I said earlier it was acting like it doesn't an ohms input signal.
You might want to remove the tank sender wire from the tank and input a fixed ohms signal and see how the gauge reacts.
edit-36.5 should show as 1/2 with your 73 ohm gauge
You might want to remove the tank sender wire from the tank and input a fixed ohms signal and see how the gauge reacts.
edit-36.5 should show as 1/2 with your 73 ohm gauge
