I just had my Titan 40 Gal auxiliary tank installed yesterday (3/29). After some initial problems, in which the installer and I believe the system had to prime (the pump kept kicking off as I tried to transfer fuel about 8 times) itself. Once primed the system worked great - I had no codes kicked by the DIC on my 2017 GMC 3500....and the fuel gauge slowly moved up while I was driving. The system is designed to pump 5 gal and the shut off, and will restart when I hit the power button again....I can manually operate the system as well.