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https://wiki.teltonika.lt/view/FMB120_I/O_settings
Bluetooth Fuel sensor
https://www.jv-technoton.com/products/fuel-level-sensor-dut-e-s7/
It's possible to configure this FMBXXX devices (except FMB640/FMB630), you just need configure in the device by sending protocol.
There is compatibility with FMB120 device.
Technoton has other Fuel sensor according to your need as DUT-E2 Bio (https://www.jv-technoton.com/products/dut-e-2bio/) which are regularly filled with different fuel types, or DUT-E GSM (https://www.jv-technoton.com/products/dut-e-gsm/) which are Fuel level sensor with in-built GPS and GSM