After I had my car off the road for a month or so I added Stabile to the tank. I did "close the loop" when I removed the engine. I am getting ready to re install the rebuilt engine this week.

Question...should I go ahead and drain the tank [just to be safe] or will the closed loop on the fuel line and Stabile do the trick?

A month is all? I wouldn't worry one bit.

No, a month before adding the Stabile and about 3 to rebuild so it's 4 months total [so far].

I use it in my boat every winter. Boat sits from November thru April most every year. No problems.