Question
My pump has been working this spring.  I have not run it for about 4 weeks.  I was testing the system to go on vacation.  The system ran for about 40 min.  then the breaker triped. Now every time I restart the system the pump starts, and after about 15 seconds trips breaker.

I have checked the intake, it had lost prime.  I reprimed with no luck.  I checked footvalve, it seems ok.   
Whats steps do you suggest to try next?

Answer
Thanks for the question.
A couple things come to mind about your pump. The motor may be burned out. The other possibility is the motor starting circuit inside the motor may have a problem. It isn't an easy item to test, I would suggest taking the pump to a electric motor shop. They can test it quickly.
Wish I could be more help.

Matt