Any update on this matter? I'm exactly in the same situation with an FMC130 with firmware 3.27.13 Rev54. I have tried both AIN1 & AIN2 with IO set to Low priority, I have checked with a multimeter and confirmed I am receiving the correct mV values from the fuel sensor but the tracker is stuck reading 173.
Any Ideas?
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Update on this matter....I found out that the tracker´s harness sometimes have an issue, pins for certain cables are pushed back rather that properly connecting (making contact). I disconnected and reconnected the harness to the cable and wiggled the connector a few times and finally got the correct reading from the fuel sensor.
Hopefully Teltonika can use this info to improve the harness manufacturing process.
Regards