Peugeot 307 lack of power then will not start

iv had my car from new and had a few probs with it but one day it wouldnt start for my wife so my son went to have a lock at it and what he do was sqwees the the bleed thing on the top of the engine and it started she went to work but the car had lost power she got to work and parked the car when she finished work the car wont start iv had a dignostic test done and there was fauts every where can this be my ecu. and iv had a lock in my fuel filter and there is some file'ingss in ther and my manigment light is on do not know the codes

Thanks alot chris