F1 EVO fuel gauge inop

[Robb]

The fuel gauges in my F1 do not work so I fly by fuel consumption on my GRT display. There is a note in the builder log that they will not work due to wing design. Just wondering if any other EVO wing guys have theirs functional? Not critical as I monitor it a few different ways but it would be nice to have them function. I have SN 175 early build in 2006

[F1Boss]

Are the gages both INOP? The floats will read full until the fuel drops to ~16 gal or so - due to the long tanks.

[molson309]

My gauges work as Mark described. Stay on "F" a long time but eventually drop after the fuel quantity is below about 16 gallons.

[AviatorJ]

My 10 does the same thing, I think that's just the nature of those floats. My red cube is pretty accurate though.

[I-TERA]

As F1Boss said the geometry of the wings and the length of the tank prevent the float from moving until there are 16 gallons left. With a capacitive level sensor and two plates positioned appropriately it is possible to have a correct indication from full to empty, the obtainable precision is in the range of 1/4. The photographs are explanatory.
The major drawback of the electronic sensor is the reading error when using fuel containing alcohol that has absorbed humidity.
Claudio
https://www.dropbox.com/s/dvux6ap62l...copia.JPG?dl=0
https://www.dropbox.com/s/vi6qntqa6w...copia.JPG?dl=0
https://www.dropbox.com/s/xlu1rncw8y...copia.JPG?dl=0