Electric motor keeps tripping GFCI receptacle.

[Bjorner]

I have a Little Giant Pump Model 517012-51200T-20. It pulls 3.4 Amps full load.

It's connected to a 20 amp breaker on 12 gage wire to a brand new, name-brand 20 amp GFCI receptacle in a weather proof enclosure. Nothing else is on this line.

After about 6 hours of run time, the GFCI consistently trips for no apparent reason. The power cord is in good condition.

Any help/information would be greatly appreciated.
Thank you very much!

 

[tom baker]

We see a lot of questions about GFCIs tripping, it is almost never the GFCI. Have an electrician look at the wiring of the GFCI.