I put clear tubing on the pump return pipe so I could see when the tank overfilled.
42 Qt 176.7 ohms
44 Qt 182.4 ohms
46 Qt 188.3 ohms
48 Qt 200.5 ohms
50 Qt 206.7 ohms
52 Qt 218.2 ohms
53 Qt 218.3 ohms
54 Qt 223.9 ohms
55 Qt 229.0 ohms
56 Qt 234.3 ohms
57 Qt 234.3 ohms
58 Qt 243.6 ohms
59 Qt 243.8 ohms.........overflowed 6 inches above top of tank. My old sender showed leaking also. So I pumped out 1 gallon and called my test done.
So it looks my my tank fills to 14.5 gallons. Not that you could use all that fuel since you can't pump the tank dry.