Hello, since I changed the fuel filter and the fuel prefilter at my 200D it doesn’t start any more. I didn’t make the beginner’s mistake to pour diesel into the new fuel filter. I’ve already done two times the battery empty while trying to start it. The fuel pump seems to work. I unscrewed the new fuel filter again after the battery has become empty for the first time, and there it was full of diesel. he described the fuel system in the Etzold ventilated. It immediately came out of bubble-free diesel where I had loosened the hollow screw (3) when I operated the hand pump. When I had tightened the hollow screw again I pressed the hand pump again. Then immediately diesel came out of the hand pump. Is this normal? Now I want to check if fuel arrives at the injection nozzles. I have read that the nut should be released at an injection nozzle and that Since I don’t know my question so well yet: Do you solve the mother below or the mother above (see picture)? I would be grateful for further tips.