Engine went off and didn’t want to go!

Hello everyone and happy new! So my year is not well started. My transit from 1988 with 2.5D Maschiene (4AB) doesn’t want to start any more! Today I won the race at noon, and off over the highway. Since I had time today, I was always able to drive 80Km/h. Unfortunately I only got 5km far. He didn’t take any gas, the engine just went out. Without jerking or anything else. He didn’t want to jump on the side strip any more. (The landscape has the car w The ADAC could not help any more. So : It has not been wrongly fuelled. The steering tooth is intact. Diesel filter and oil is just 1.5 months old. Starter turns but engine does not start. With starter help spray (start pilot) he made signs to start, but no more. ============================ Where can it be ?? ======================= How is it with the shut-off valve ? If it does not get power, the engine goes off ? The injection pump can be used for If I had collected water in the diesel filter, I still have to check, but if it were so, the engine would also have pushed strongly ? Is there a safety or relay for the shut-off valve ? Please for any suggestions, what it can be about. Even if it can be illogical for the 1. ..