Peugeot 207 poor starting, air in fuel line

Nothing you can do but try and find where it's drawing air from assuming you changed the seals when filter replaced .

Yep changed seals, wondered if hairline crack in housing?

It's possible , got to check all the fuel lines, and the connections .

Well fuel filter replaced and prefilled with fuel before fitting, Completly removed air intake and checked fule lines and nothing worn through or damp suggesting a leak. Inspected fuel line all the way back to the tank. Two of the injestors look wet, not oil. No obvious carbon build up i would expect to see if the seals were blowing past but air is getting in somewhere? Do these suffer with either injector seals or fuel pump issues? You would tink with the volume of air i am seeing it wouls be obvious.
The only way to get fuel up is to such hard, which is no soultion and tastes disgusting :-)
The small pump primer is about as much use as a choolate tea pot.
Thanks

Injector seals leaking are a very common fault . Here are some ideas from forum

https://www.peugeotforums.com/threads/1-4-hdi-starting.138825/