I've mounted a Satio 150 inverted. I'm getting mixed signals on the fuel tank location. Some say as close to the firewall as possible and on the fuel tanks centerline. Others say a little above the centerline, some say below the centerline. Help!!

if you don't care about having the tank on the cg for aerobatic purposes,(will require a pumping system) then put it as close to the engine as you can.

inverted engine mounting....
putting the tank high in relation to the carb can cause a siphoning effect into- and -down the carb... directly to the combustion chamber. the engine will still run good but will make the idling very finicky and sometimes impossible.

for inverted engines, it is a good idea to put the tank much lower than you would normally.

I would recommend right up against the firewall and even with the carb. That way it will run the same inverted as right side up. That's how mine is. My motor is sideways but I don't see how inverted makes any difference.

Tom