Replacing Pump

[Skitch]

Crazy question, but the pump is screwed down and even after blasting them with pentrating oil, I can't get the screws to turn to remove my old pump from the base.

Any advice?

edit - Put a pipe wrench on my screwdriver and that did the trick!

 

[Texas Splash]

Put a pipe wrench on my screwdriver and that did the trick!

I was going to say a bigger hammer , but you already solved it.