Pool PUmp MOunting

[mayash]

Everytime we get a good rain my Pump ( 220 V ) kicks the GFI breaker and won't work until it is dry again. I checked and I don't think water is getting inside the wiring on the pump but wondered if the pump should be sitting on conceret like it is today or a rubber or wood mat? I think maybe it is finding ground through the ground instead of the ground wire? Looking for ideas.

Mark
Marietta, ga