Hi Ken I faced as well some issues with the indicated fuel level no matter if we are talking about the original 250mm or the longer 280mm version. I get a better idea what might be the reason for that issue I measured the resistance in Ohm directly at the fuel sender. The VDO tubular senders will report 90 Ohm when the float is at the lowest position. At the highest they show around 0 Ohm. After having driven 205 miles the value was at 75 Ohm and I was able to refill 6,6 us gallons. The instrument reported 18% fuel level (just ignition on, but engine not running). After starting the engine the fuel level dropped to zero. I was't able to figure out why the fuel level is always dropping after starting the engine, but I watched this effect frequently. I forgot to measure the Ohm value with running engine, to see if it will drip down as well. Normal VDO fuel gauges can be adjusted to the zero Ohm value, but it is not clear, if this is the case for our instruments as well.
M3W willow green,Triumph T100,KTM LC4 Adv./Freer.250R, RD250/RS125DX, Alpine A110 Kurt
