Thanks guys. I just assumed that the tank placement in the design of the plane would be right!! There was a significant amount of siphoning that I tried to solve by routing the lines at different elevations. That improved and I put an on-board glow on to help keep the plug lit. It seems to run fine on the taxi out to the runway (about 30 feet) and I turn up the runway about 10 feet and the engine quits abruptly. The same as it did before I put the on-board glow on.