Okay, a little late here, but here's what I've been able to find out.
I contacted American Powder Coating in Downy, CA. They were none too friendly when they found out I was only an individual, and informed me that they only do work for Companys. (read volume)
After some more reasearch, I found that the process is patented to Goodrich Technologies Corp. Sure wish I would have read American Powder Coatings website better...it's llisted right there! DOH
Anyway, Gary Goodrich was very pleasent to speak with, and gave me the name of his shop guy who is in charge of the coating for them. Yes, they will do small parts for individuals, but their machine is only 24" in diameter, and 10" deep.
So, I'm going to take pictures of my various pump pieces holding a tape measure in the picture for reference, and email them- possibly they will be able to give me a price quote from the pictures.
More on this as it develops.
Ken F