ok, after closer inspection, there might be a leak from on of the fuel injectors. The reason I didn't think so before was that there seemed to be old fuel on top of the rail. So I guess I'll just change out all the injection o-rings, while changing the PD, and just monitor it closely after that.

If the rail is leaking where the fuel line comes in on the opposite end of the FPR, you can take out the banjo bolt (I think thats how its connected) and replace the copper washer.... maybe that will take care of it.

I think I'll do that, just to be sure