What makes you think io29 is the fuel? Do you have the documentation?
I've had a skim through the various "Teltonika_Data_Sending_Parameters_ID" pages for a few trackers, and io29 appears as an axle load, not a fuel level. Are you using their Bluetooth fuel level sensors or just one of the analog inputs as a fuel level reading?
We are using Teltonika devices that support fuel sensors. We are currently facing an issue where the fuel value shown in the Teltonika Configurator is 3672 kvants, while in Traccar the corresponding IO29 value is showing only 36.
Is this an issue on the Traccar side, or is this the correct value after conversion?