Close up left fuel tank sender plate, and adjust sender arm

In the left wing the fuel sender faces forward. I tweaked the sender float arm angle so that when the float was in the empty and full positions, the arm was about equally clear of the sender stops.

The resistance in the empty-tank position is 36 ohms, in the full tank position 191 ohms. Note the minimum resistance of the sender is 9 ohms at the stop - several potentiometer steps before 36 ohms is reached. That is what I want - a clearly resolved empty condition and in no way obscured by the sender float arm hitting the stop prior to the empty tank condition being reached. Things are less important at the top end, since the the state of a true full tank does not actually correspond to the "full" float position, which is actually pinned against the skin due to the wing dihedral.

EZ turn was lightly smeared over the cork gasket. Loctite 243 was used on all the M4 bolts, which were progressively torqued to 17.7 in-lbs. I did not use 577 as no sealing is required of the bolts (due to the fuel tank sealant covering the rear of the rivnuts) nor 277 (as to do so would cause the rivnuts to spin out if the sender plate ever needed to be removed)

Prior to testing EZ turn was smeared over the fuel tank filler cap gasket to ensure no leakage - no other measures were required. The return and overflow ports were sealed with AN caps prior to testing

After pressure/leak testing the sender M4 bolts were torque-marked