audi a4 b6 will not start
 

Car ran perfect,went in the store five mins later car will not start,after towing it home and working on it for a month still can't get it started.
So far I replaced the camshaft position sensor-the crankcase senor-coils,plugs and harnesses-injectors and new cups - ignition switch - breather hose and check valve- valve cover gasket - fuel filter - all new vacuum hoses.

What I know so far, battery is good- have spark,compression, fuel pressure at rail is 48,58 while cranking, but no fuel through injectors. Have a pulse and 12v signal just not firing... pulled rail and cranked nothing, sprayed starter fluid in cups engine fires up and injectors spray but dies secs later, I'm really confused and don't know how to get it running,any help would be really appreciated, thanks