Woof, I'll be reading that thoroughly tomarrow, Geo, my GF's here and antsy.
Thanks a ton! I do have a secondary/grease filter, but your advise still makes sense. Trouble is, I replaced the banjo on the filter housing with a solid bolt today, and I still have froth coming through the overflow. Looks like it's coming from the injector-overflow-daisychain thing, no the IP overflow. Does that suggest anything to you? Thanks a ton for taking the time!
Ash