Petey, I think that the 1HP pump at 115V should be on a 30A breaker, but the system might squeek by with a 20A breaker. I don't think that its a ground fault issue. The #14 wire is ok, but my Square-D motor sizing chart says that the breaker should be 30A.
Below is a link from Square D so that you can download an IEC Motor Data Calculator and other small but helpful product selection programs. Hope this helps.
http://www.schneider-electric.us/su...alculators/calculators-and-online-tools/
