I have a 2000 Passat with an AJM engine. I have problems starting the car as I have to turn it over for approximately a minute whilst pumping the throttle. When it does finally start I have lots of white smoke from the exhaust - and I mean lots! The car has recently had a new head gasket and turbo fitted. It is not burning oil so it would appear to be a fuel problem. The fuel filter has been replaced. It is as though air is getting into the system somewhere. Has anybody come across similar problems before?

Any ideas before the car goes into VW for diagnosis and I empty my wallet would be gratefuly received!!
Thanks