Tonight I spent a few more hours in the shop with my USB camera on a flexible wire and my ohm meter. I had already bent the wire per VAN's measurements including the return bend that acts as an anti-rotation tab and goes into the fuel sender pivot point. The bends were quite accurate and true.
1-The float does bottom out where it should physically and the resistance also reads the max of 247Kohms. This is the 'tank Empty" value. Good and the most important reading.
2- The float does not travel to the top of the tank. I found that it clears the vent tube but hits the skin stiffener. There is not enough clearance between the vent tube and the float to correct for the overlap of the float hitting the stiffener. So, the resistance at max fuel reading is 56.2 Ohms and the min on the sender is really 31 Ohms. This does not sound like much but it appears to be a significant amount of travel on the float arm. See picture and video. The picture shows where the float arm is at 56.2 Ohms. The video shows how much movement is still left from the 56.2 Ohm reading to the stop point and reading of 31 Ohms.
3 I realize that I will calibrate the tanks by adding fuel in known increments and it is good that Zero, will be as accurate as possible.
4) But if the float does not travel to the top of the tank, It will read full for a longer period of time than I may desire casting doubt on range and duration. I plan on using a fuel flow meter, but I would like the added information from the floats. Also, won't the EFIS fuel reading jump from full to something less than full the moment the arm starts to move, say from 30 to 24 Gallons. I guess I could calibrate it to only read 24 gallons or whatever the actually reading is when the float hits its artificially short stop. I visually check that the tanks are full every flight anyway so I would know I would have a known amount of extra fuel to burn before the floats become "Accurate".
5) I wish the QB wings came with the floats installed. It appears the QB team did not bend the fuel vent per plans to accommodate the space needed for the float.
Builders Blog http://elstien.us/wordpress/
Tail Kit delivered 6-2013
Started building April 2014
QB Wing and Fuse Delivered December 2015
Finishing QB wings on September 2018
Dues Paid through 2018