As clarification, and correct me if I am wrong but the OP in the first post mentioned "GFCI Breaker" not receptacle. So in this case if the pump were pulling more than the 15 amps it would trip the breaker (GFCI breaker) or even a regular breakrer and it would also trip it if there were a ground fault any where in the wiring between the breaker and the outlet itself.
Is the OP sure that the breaker is a GFCI breaker or a regular breaker and just mixing terminology as in the rest of the thread the GFCI is now being referred to as a receptacle and not a breaker.
Fix'n it:
Is the OP sure that the breaker is a GFCI breaker or a regular breaker and just mixing terminology as in the rest of the thread the GFCI is now being referred to as a receptacle and not a breaker.
Fix'n it:
A GFCI breaker or GFCI receptacle will trip when it senses a current leakage of between 4 to 6 miliamps. This could be due in this case that the pump (motors cause this) is worn. The GFCI (through its electronics internally) measures the current going out on the hot wire and measures the current going back in on the neutral wire, if there is a current imbalance of between 4 to 6 miliamps it will trip indicating there is a ground fault.
