V40 diesel 2014 won’t start after fuel filter was taken out

[Fhafez]

Hi everyone

First post here and a desperate one it is!
Just bought a V40 1.6diesel last week with 170k on the clock

Wasn’t sure when the last time fuel filter was changed and it seemed to vibrate slightly on idle so opted to have the fuel filter changed.

My partners uncle is a retired part time mechanic who said hel do it for me (oh how il live to regret this!)

He disconnected the lines and took out the filter but couldn’t undo one of the three screws on the housing unit as the thread had gone, so we decided to leave it. Connected the lines back in

Now unfortunately the car doesn’t start! Absolute nightmare

Called RAC who first tried to spray something to get it started, which did start it but cut out straight after. Then he got a hand pump device but ddnt have the right fitting for it? So my cars still unable to start.

Any help is greatly appreciated. Thank you!