Omega B does not start

Hello, I’m new Here at Motor-Talk and I have a big problem with my Omega B Caravan (x20xev BJ/1995). Because he doesn’t start any more A week ago he didn’t start, we decided on FC 19. Then the KWS was changed (Original Siemens). He still didn’t start, now FC 92 was set, the NWS (also Original Siemens) we exchanged the day before yesterday. All without success! Error codes are no longer stored and are not set anymore. Yesterday h We replace the DIS, ignition cable and the BPR, but did not do anything. When ignition “one” (BPR switches) petrol pump starts briefly, when you try to start the MKL turns out of starter but normal. Fuel is injected, candles are wet. Why does the MKL go out when I start, normally the MKL would not have to run until the engine runs out!? Would be great if someone could help me further.