[Jim Smith]

Ed, I did actually think "wow is this situation so unique I've stumped everybody or no one else has ever had this occur!"

I've come to the initial conclusion that the only way this can occur is through a fuel valve. However, with the balls in the valves being spring loaded and the plane stationary when the problem materialized, I just can't see how they could fail in such a manner that would cause a complete change in fuel flow. Maybe a little leakage one way or the other but not a complete change. I exercised the valves through all of their positions when I checked for proper positioning and detents, and will do my one hour test flight this week and report back to everyone if the problem persists or has 'corrected' itself. Quite frankly, I sure hope it hasn't 'corrected' itself without me taking any corrective action.