while you are correct that there is no "return" per se` from the fuel galleys to the fuel bowl... a high pressure oil leak can and will push past the 70max psi fuel pressure with all of its 3000psi might during a wot scoot down the road.

pay heed to what Brother Rich said about your compression numbers...
start looking for another motor... that one is on borrowed time with even 1 cylinder reading 200psi.

if you can stand for it to be down pull it NOW and get it into a machine shop.
since there still is some compression there is a good chance it can be salvaged...
even if it means sleeving cylinders..

 

The autoenginuity tool seems to be the best. With the OE Ford upgrade I can buzz test and do a contribution test. All sorts of stuff. I'm going to make a YouTube video about my Innova vs. my autoenginuity scan tools. Major difference but original purchase price was the same. The upgrade was another 200 but worth every penny.