That's basically what I did except when I had it plugged in I just pushed it from bottom to top and watched the gauge. It maxed the gauge maxed out at between half and 3/4 with the float at the top. Filling it up this afternoon produced the same result.

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Central IL
1977 450SL - Orange Julius

1982 300D - Blue Steel

2014 E350 Coupe
1992 Ford Ranger