Well flintlocke, 45_100, and sackett were pretty much all correct. It took a while to get this project completed, but we put the new injector pump on today and it fired right up. The old pump had rust inside, a failed ring, and a crack somewhere - all leading to clogs on the return side. FYI a rebuild is $1700 and a rebuilt pump with a core exchange is $1900 these days. Thanks all for the help!
At least you got 'er going. Man, schit sure has gotten expensive.
