This was installed a year ago and it worked fine all the time

line is a 30amp ( if I am not mistaken ) it runs a pond filter pump a pond ultra violet light and a pond air pump

Nothing changed this year other than 4 days of rain so far and the GFI wont stay on I have 3 GFI outlets on the same feed line but separate feeds ( each one on its own ) and the pump does the same thing to all 3

the pump have a tap on top with a metal screw that shows some kind of a sign like a old TV antenna is that a ground tap ? should I ground the pump straight to a metal pole into the ground ?

Thanks for the help