TrailBeast said

I use a flat screwdriver between the cast body and the tank where I can twist the screwdriver like I was turning a screw and it pops loose.
Just be sure you have all the bolts out of any place that they go through the tank itself.

To remove the shaft seal tap a small flat screwdriver through the metal casing of the seal on the outer edge and pry it out.
Be at least a little careful about scratching the shaft, but it's not hard.

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