I'm pretty new to working on this engine and have had a tough time narrowing down a diesel leak on my 86 6.2L. The leak is pretty significant after running the engine about 20mins, but doesn't leak when off. Also my truck has been hard starting since that leak appeared. Only method I've found to get it started is to bleed the fuel filter assembly, then it starts right up...To that end, I'm also now in need of the top bleed valve on the fuel filter as mine was sheared off at the top of the threads and is getting to be a pain to remove and tighten each time I need to start it. (I haven't had any luck locating one at local salvage yards, so If anyone has an extra lying around you'd like to part with let me know)...Any advice on narrowing down this leak that anyone could provide is appreciated. Thanks, Robert.