A method used in large aircraft is capacitive sensing - this will give you = a reading in mass (and hence the actual burn time you have left for the = fuel.) I must go look at the old aircraft mech notes to get circuits etc. >>> bmoran@MILLENNIUM.CA 06/25/02 01:14PM >>> ----- Original Message ----- From: "Pic Dude" > Almost every fuel-tank sender I know of is resistive and > runs electricity thru the tank. Except for that floating > stick protruding out of the tank on a Piper J3 cub. So, how could we implement a fuel gauge that was accurate? I have a few ideas: Eh.. just some random ideas, maybe someone can have some fun with them. --Brendan -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu