UKPassats

hi guys sorry for a post again right ive put my 1.9tdi preg into a h reg b3 which was a vr6 engine loom in fine and all goin well so i try and start it yesterday which was saturday now ive kept the same fuel lines in b3 and fuel pump that ran the vr engine i took all the fuel out the tank with the pump on and off and put diesel in .now tryed to start it wont start just turns but lots of air in lines as well .if i spary sum gas in intake it runs and stays running but when u turn of wont start still untill u gas again.so iv put a direct feed on and return and it starts but when u turn of wont start of key again .but to be honnest my batterys ant much good keep goin flat quick so gonna get a new battery .so im hopeing some one can answer my question here ive got the fuel filter in engine bay which was on the b4 but the one is still down the back by the drivers wheel which was used for the vr engine can this cause me the air locks or not .. and also some one on here said i can still use the vr6 pump in the tank which i dont realy need because my engine pump sucks the fuel up .but to be honnest i think if i plug the pump back on in the tank i think there will be to much pressure there .but like i said my main prob is it wont start of key only gas but when gased it dose stay running and the filter down the bk end should this be removed cheers guys