BMW Fuel Level via OBD: Read & Reset

Hello everyone,

I recently downloaded the Android app 'Torque.' It allows you to display vehicle parameters via a Bluetooth dongle.
While the program allows you to display the fuel level, no value appears for me in that section. However, I know that the fuel level is stored in the vehicle's 'hidden menu.'
Now the question is, how can I access this parameter via the OBD?
(I can add custom PID values for 'Torque'; for this, I need to enter an 'OBD2 Mode and PID' value (a 4-digit hexadecimal value), a name, minimum and maximum values, the unit, and a mathematical formula.)

Thank you in advance for your help.
Gebbi.

P.S.: I have a 123d.