Yeah, I think I'd swap over.
Since I'm not familiar with the original pumps, I had to read up. It looks like the only way you'll overheat that pump is if you run it dry on gas (and it will tick continuously then), or if you get a piece of debris stuck in it with the current in the "on" position of the points. If it is the pump, it will slowly start to die on you, until one day it just decides that it's had enough, and lets you sit.