I have always wanted a fuel gauge but did not want big holes in my tank for the float and with the mild winter have been tinkering in the garage and have come up with this albeit experimental idea based on a sight tube.If you connect a clear tube to a fuel tank and run it up the side the level in the tube is the same as in the tank.
A 10mm reinforced tube divided by 6mm nuts into chambers for 2,4,6 and 8 litres has been plumbed into fuel line via a brass T piece.Light from leds shine through the tube and into fibre optic strands that can be terminated in speedo,legshield tool box or in my case temporarily a toothpaste tube top on my crash bars.AS the fuel level drops floats lower and block off the light see diagram
A vent pipe is arranged so that should machine end up on its side it is always higher than fuel tap. 12volt dc power for leds comes from back light drawing 110 milliamps just over a tenth of an amp.
You can run this off two AA batteries using standard leds via a 47ohm resistor, or just have one chamber and strand for reserve.
This is still experimental but If anyone is interested I can post more pics.Cost about £20
Folly or FFOLLI ( fuel fibre optic Led light level indicator)
Its all done with lights, pipes, pens and some 6mm nuts although one nut is 1880mm( that's 6foot 2 in old money)
Grandpa
