Gas Tank Sending Unit Trouble Shooting

[mockingbird812]

Thought I’d share some findings I discovered tonight. My fuel gauge has never worked as long as I have owned my Chevelle. My plan was to remove it and send it to a shop here in Ohio for a rebuild. I decided to check the resistance with my multimeter to see what was what.

1st up I noticed that I had an open circuit (1st photo) when I touched the multimeter positive probe to the sender post with the float at its empty-tank position. When I flexed the probe to one side or the other I was able to read a low resistance (.9 ohms) intermittently (2nd photo). Then with the probe flexed to the side i was able to get a reading of about 92 ohms with the float at the full-tank position (3rd photo)....