Let's see if I understand...

I'm not saying that the tank is above the spraybar - I'm saying that it's a bit higher than I've read or understood to be the "standard" - just enough to maintain a prime and/or sligh siphon.

In the configuration I set up, the fuel level is a bit high when the tank is full and the plane is level upright. When the tank is about 1/2 full, the level is low enough to stop siphoning. That puts the spraybar about centerline of the tank. So if I understand you, what you and I describe is pretty much the same thing except that the centerline of my tank may be closer to the spraybar.

I've read that the fuel draw tube (not tank centerline) should be a bit below the spraybar. This is the setup I see commonly. It appears to me that this would give you a richer run inverted, whereas the setup I describe will be more consistent.

I was trying to show that having a slight siphon in an inverted 2-stroke isn't such a bad thing because it maintains a prime and excess fuel just drips out the carb. I would think that if the tank centerline was just below the spraybar, this is what you would have on a full tank. But in an upright engine, a slight siphon like this would flood the engine if allowed to sit before starting. That's why I thought the idea was to have the fuel tank lower than you described.

So are we pretty much describing the same setup?

thanks