Peugeot Elystar 50

Hello all, I got a Peugeot Elystar 50 very cheap. The scooter is year 2002. According to the previous owner all ECUs have been changed. Nevertheless, the scooter could not be moved to start. I looked at the spark plug once. This is dry despite many start attempts. At the control of the injection unit I noticed that no petrol is atomized. Petrol is promoted by the petrol pump. Has someone a advice or this problem scho Thank you very much.