Right i have a 2005 focus tdci 2 litre as my daily drive and recently its become a pain in the arse to start from cold, first thoughts were a fubared injector as ive heard there common on this engine for goin tits up. Had a nosey around the engine bay nothing obvious then noticed i had air coming out of the fuel filter to hi pressure pump line. as i crank the engine it clears and eventually starts but is still pulling air in somewhere. If i go for a drive then stop it it'll fire up streight away with no problems. I was thinking they could be a one way valve thats knackered somewhere? theres no leaks anywhere so wot u guys think as im clueless now and a mechanic myself for land rover so abit of help/input would be great as ive never touched one of these engines before, many thanks nick.