have you tried to move the plug to another breaker in the house, with an extension cord, to see if that is the problem?
is the breaker flipping?
you might be exceeding the rating of the breaker, especially if you have your lights pumps etc plugged into one outlet/breaker.
The cheap (not recommended, and definitely not to code) fix is to upsize the breaker amperage if this is the problem. The breaker box, out in the garage, or behind the house usually. If its 10A service, try a 15A. You are usually safe with one size up.
With that said, this is not best practice, and you could set your house on fire doing this.
c