How to get the gas level from a carburetor gas thank, to the GPS

Good afternoon Wialon Team, excuse me i have a tecnical question.
We have a client that has various RAM 4000 units with carburator gas tanks insted of the tipical fuel tank, we need to dectect the gas level with a sensor level, and from that sensor we need to send that data to the GPS and display it in Wilaon.
Is there a sensor that we could use to get this data from the tank to the gps?

Thank you, any help is appreciated.