The fuel injector return lines on mine caused that exact symptom as you described. Get yourself a complete kit, as it has all of the pieces needed.These are made of heat and fuel resistent material which will last many years. Since you are new here you may want to fill in the information in your signiture which appears at the bottom of all posts. You can see an example of it at the bottom of my reply. Let me be the first person here to welcome you to The Diesel Page!
94 Chev Blazer, 6.5TD, 3.42, 4WD,Gear drive,,Remote FSD behind drivers headlight,,Mobil 1 in difs and trans,Rotella 30W, Over a quarter of a million miles !! Member -1.94 club.