Fuel sending unit testing

Connect one ohmmeter lead to the electrical connector and the other lead to the mounting flange. Move the float slowly and the resistance should change smoothly from about 10 ohms in the full up position to 73 full down. I have one car without a gauge (fuel cell) and I keep a log book of miles driven and fill up regularly,it keeps me from running out of gas. The only time you can have too much gas is when your on fire.