Somewhere on this site probably 3-4 month ago someone posted a link to a small pump cover that you can buy. As I recall it was some fiberglass or plastic thing open at both ends for ventilation. Keeping the sun, rain, and weather off the thing is always better. Running in the rain is probably the worst thing you can do. Although they are designed for outdoor use the moisture that gets sucked in by normal cooling does corrode or oxidize the metal parts making it a dog to ever take things apart.
Al
Edit: In spite of the lousy search capability, patience pays off. Here's the thread:
http://www.poolforum.com/pf2/showthr...ght=pump+cover
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