I have a 2014 Citroen DS3 1.6 diesel and the fuel filter is getting air. I managed to find out from which pipe it is getting from but not sure what that pipe actually does. I have attached the image with the circle around the pipe. I have replaced the injectors and return hose for injectors if this is of any help.
The second thing I have noticed is that there is a lose electrical cable behind the fuel filter; I have tried to find where it meant to go but couldn't find it. I have also attached a picture showing the loose cable.
Thank you for the help and have a nice day