A diesel leak up their is either the return lines or you hard pressure lines. You would know if one of the pressure lines was leaking the car would run like crap. Check your return lines again I bet their the problem. My car did the same thing, I thought fuel was leaking up around the injector it turned out a return line was leaking.

__________________
2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200