GTN 750 & ETX Touch not talking!

[Glen Davis]

I have a GTN 750 and a GTX touch in my Mooney. When I fill up with fuel, the fuel quantity gauges which show on my GTX touch  automatically show full fuel in both tanks. In other words, I don’t have to tell the system that I just re-fueled. My GTN 750  has a fuel mode that allows me to enter how much fuel I have on board and what my fuel flow is. My question is to these two systems talk to each other? When I fill up with fuel, should my Garmin 750 automatically know that or do I always have to enter these numbers manually. And, will the Garmin 750 read the actual fuel used just like the GTX does or does it just estimate using the fuel flow figures I plug in? 

[PT20J]

Not sure about the non-Xi version. There was a software release a while back for the GTN Xi to allow it to show fuel data from the G3X. It also required changing a setting for a connection between the G3X and GTN. I’d check with your Garmin dealer.