Hello first of all, I am 42 years old and come from the surroundings Stuttgart. I am a truck driver by profession. Drive a GMC R3500 BJ 1991 with a 6.2 Detroit diesel and a 4L80E transmission. Have the following problem and I hope you can help me. He suddenly didn’t want to jump any more. I then checked all the glow plugs, power supply of the pre-glow system, all as far as Ok. Then I checked whether the fuel pump is pumping and I noticed that this is defective. Now he demands diesel into the injection pump but no diesel comes to the injection nozzles! I opened all the pipes and torpedoed them. There are only drops. Did the injection pump open housing and the chamber is full of diesel. I also tested the relay immediately and it opens and closes as soon as 12 V. What can this be? Bzw how much diesel comes from the injection pump to the injection nozzles? Does it have to flow or drip there? Ic h hope you can help me there and would be really grateful. Greetings