http://www.flotecpump.com/residentia..._faq_sump.aspx

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Q. What is the most common cause of sump pump failure?
A. Probably the most common cause of sump pump failure is electrical in
nature. Plugging the pump into an extension cord, or an outlet that
shares a circuit breaker with other electrical items, can cause the pump
to receive low voltage. In order to run it then has to draw higher amps.
That causes the pump to run hotter. Heat is the enemy of electric motors
and can shorten the life of a pump dramatically. We recommend the pump
be plugged directly into an outlet (no extension cords) and that the
outlet be the only thing powered by the circuit breaker (or fuse) that
feeds it.