At 02:49 AM 9/4/2016, you wrote: > I always do a visual check. Top off before each flight. Then time the >fuel usage by engine run time. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Topping off and timing is accurate but I prefer not to take off with full fuel (25 gallon) on every flight, especially a local ride. My long tapered tanks in the outer wings don't lend themselves to good senders. If I can see the fuel on the bottom of the tank at the fill hole then I have approximately 7.5 gallon in that tank and I time from there. My suggestion if you want an electrical gauge is to put a stand pipe just behind the seat with a capacitance sender that equals the total height of the fuel in the tank. Even then it won't be linear as the tank gets thinner outboard. Site gauges would be more accurate as they could be marked in a more accurate scale. They would have to be located just forward of the front spar to be visible and accurate. Gauges in wing tanks that are odd shaped and elevated at the tip are seldom ideal. Even the RV10 with floats in the wing will top out at 22 gallon in a 30 gallon tank. At that point the SkyView just says 22+ gallons. The requirement in the USA is that they be accurate at EMPTY. If you are using instrumentation such as a SkyView that the sender is feeding from a standpipe or a long probe in the tank, it may be possible to calibrate accurately but just sending to an electrical gauge that you simply calibrate for full and empty, will not be linear. Larry Flesner
