Dr. Dave,
The fuel outlets from the tanks have finger strainers on them and I can't immagine any way a ball of ice could choke one off. I believe most Cessna
airplanes built after the C-170 series have two outlets in each tank that are teed together on the way to the selector valve.
There most be another explanation for that particular problem.
Fuel Tank Vent/Water Contamination
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