EFI Conversion

The second issue is the system drains my battery if the car is not in use. So I keep a battery tender on it until I figure out what to do, I plan to call Fitech back on this and ask them what could be causing this..

it's the hand held. Fitech has stated they didn't think anyone would want the handheld to stay plugged in and visibly mounted, so it's not designed with that in mind. Simply unplug it when you know it will be sitting. It won't lose anything, mine hasn't anyway, and no longer drains the battery