Hey Brit!

Thanks for the reply. So, what you are saying is that the centerline of the tank must be as if the engine was upright. That makes sense, but may be easier said than done. Why do they design the airframes to have the tank not in line with the fuel flow centerline to the carb? (probably rhetorical question).

I don't recall where I put the tank on the Venus 40 but, as I said, the OS 50 runs just fine. I start the thing inverted, then turn the plane over after it's started. The idle is down around 2300 rpm and continues to run there so I assume that it's alright.

Now comes the challenge with the Excelleron 90 and the EVO 100.

Thanks again.

DS.