I have removed the fuel sender unit from the fuel tank of my 1962 Valiant.

What is the correct way to test the functioning of the fuel sender unit?

Thanks, Peter

Using a multimeter attach 1 probe to terminal attach other probe to body of sender. Move the float arm and watch the resistance (ohm) values. There should be a gradual change in resistance at the arm moves. If the values don't change or jump around the sender is probably bad. A small side note is that some multimeter can be a little slow to read so make sure you are moving the arm slowly. I can't remember the high and low reisitance values off the top of my head but I am sure they have been posted here before.

Switch VOM to ohms (resistance low scale 200), place meter’s black lead to fuel tube where car’s fuel line would be connected, and other lead to electrical connection that fuel gage connects to. Move float lever from full to empty and record highest and lowest ohm reading (somewhere between 10 or so and 78 ohms is about normal). While moving float look for any changes in reading outside of the 10 to 78 reading which would indicate an electrical interruption between resistance coil and pickup as it moves along the winding which would most likely be caused by corrosion.

To check fuel gage, turn ignition to run, briefly ground the wire that connects to fuel sender unit; if working, gage will move to full. To check fuel gage out of car, apply 5 DC volts to gage; three 1.5 v batteries in series (4.5v) would be close enough to see if gage responds.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

I knew those resistance values were posted on here somewhere

Thanks guys, your advice was excellent.

Peter