I made a 90deg right turn at 30 degrees bank (onto South) towards the river. Immediately before the turn my LH fuel sightglass showed 5 litres plus. At the completion of the turn the engine stopped. I glanced at the sightglass and it was empty!
So the next question would be how much fuel did the RH sightglass show at that point in time?
Another question would be how much experience you had flying the CT at similar fuel levels?
Given that in a right turn the wing would be up, one would think that it would take significant uncoordinated flight to unport that tank outlet, perhaps an uncoordinated levelling off interrupted the fuel flow.
But remember we are talking about the last 5 litres in a 65 l. tank. This is where interruptions in fuel feed can be expected.
A CTSW manual on the web (the accident a/c manual may be different) cites fuel capacity of 130 l. and usable fuel as 124 l. That would mean a total quantity indication of 6 l. is effectively empty.
A gauge inaccuracy of plus or minus 2 to 3 litres in a 65 l. tank becomes critical at this stage in the proceedings.
One can also suspect that such a low unusable fuel quantity requires coordinated flight and that any imbalance could considerably increase the quantity of unuseable fuel.