[neiltus]

FWIW, I have the same pump plugged into a EB8, and into a regular plug that is on a GFCI circuit, without issue.

My house had 4 different GFCI runs and I had to replace all four of the GFCI because they would trip on just about any current that was not a steady draw.

I would replace the GFCI, possibly with one that is rated for a wet area (usually have a blue W on them).

Also, GFCI run MUST be wired right.