Do fuel valves ice jam due to water in fuel?

From:         mrtonka@aol.com (MRTONKA)
Organization: America Online, Inc. (1-800-827-6364)
Date:         23 Aug 96 13:44:55 
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Has anyone heard of cases where motor operated fuel valves (ball, gate or
butterfly) jammed internally due to ice caused by excessive water in the
fuel (JP4 or kerosene) freezing during flight at high altitude?

Bill Simpson