Trying to guess/translate here:

  Fuel tank (for some kind of vehicle) - Treat it as Gasoline so
potentially explosive, Gus <G>  55 Gallon Drum or something?
  Guessing that the current fuel measurement system is a (temporary)
float with a potentiometer.  And that something better is desired.
(Unclear what's "better" here, Vadim?)

  More data (as always) would help us <G>

  Mark, mwillis@nwlink.com

Vadim Jakunin wrote:
>
> Hi everyone!
> I needed to decide a problem:
> Needed to measure a liquid level in the big barrel (tank for the fuel). Is
> it Presently used system temporary Trojan war from the bob, walking stick
> and rheostat.  I wants to do on pic84 scheme and program, but can not
> select an approach variant of sensor. Ultrasound? Or same bob? Something
> the another? If someone has understood a task, help an advice. thank!
>
> Vadim
> vad@anet.lv