Rich,

The PC 9 doesn't look that bad for fuel tank position, it's not perfect but I've seen worse. I would be surprised if you can't get it to work as designed. I'm sure you should be able to get it to run well enough for a taxi test.

How much experience do you have with inverted engines? Is there someone at your club who could help you tune your engine?

My name is Dave, same as my signature below. Gerryndennis is my screen name (Geraldine and Dennis were my cats). There is no Gerry.

Dave H