I too believe that you are going to find water in your fuel system Mark. I would give your layout a real good going over and see if there is anywhere the water could get trapped. The heat from running up without movement to assist in cooling off could be hiding your problem. Look for any place water could accumulate. You may have to add a new drain. Case in point: older C 172's have only one fuel drain in the wings; when they switched to a newer style tank and fuel injection the number of total drains on wings and cowling/engine went from 3 to 13; 5 each wing and 3 cowling. May have to add one or two.
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