1928 Chrysler Model 72 Gas Tank & Sending Unit

[leomara]

Took out the sending unit and from what I can see the inside of the tank looks quite clean, not much rust if any at all, looks as if a previous owner may have done a cleaning.  About the sending unit, a geared mechanism which moves a rod up and down inside the cap.  Gearing appears free, clean and functional.  Any way to tell if it may work without actually wiring it to a gauge?

[1930 Kram66]

Hi

Very easy to test a sender unit.

Its just a variable resistor -  usually connecting the gauge wire to ground via the sender resistance coil.

All you need is a Ohm meter. Here's how-

Just connect one lead of the Ohm meter to the centre terminal of the sender unit and touch the other test lead to somewhere on the metal case of the sender.

You should see a reading on your meter that changes as you move the float arm up and down.

Typical readings may be around 10ohms for full to 150ohms empty . These values may not be correct for your sender they are a guide only.

If you cant get any readings you have an open circuit in the sender unit.

Also when testing make sure your test points on the sender are clean so that you get accurate readings.

Good luck 

[leomara]

Thank you.