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19Fordy · 10-01-2020, 04:39 PM

If you drain your gas tank on a car like a 40-48 Ford and fill it with water, will the fuel gauge give the same readings as when tank was filled with gas.

I ask this question because I am wondering if the difference in the density of gasolene and water will effect the float level and hence, the fuel gauge reading.

I would like to do this to check the accuracy of my fuel gauge and calibrate my gas tank sending unit.
Density of water is 1. Density of gasolene is .71 to .77 according to Google

Thanks.

10-01-2020, 04:39 PM	#1
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,950	Gas Tank Fuel Gauge reading question If you drain your gas tank on a car like a 40-48 Ford and fill it with water, will the fuel gauge give the same readings as when tank was filled with gas. I ask this question because I am wondering if the difference in the density of gasolene and water will effect the float level and hence, the fuel gauge reading. I would like to do this to check the accuracy of my fuel gauge and calibrate my gas tank sending unit. Density of water is 1. Density of gasolene is .71 to .77 according to Google Thanks.