another fuel starvation problem

1995 320i no fuel to engine problem dr hagerty sugested bad fuel pump and change the fuel filter.
he also gave me a part number which i put into google and found where the fuel pump was and how the tank is set up.

so what did i do
the fuel pump is under the rear passenger seat on the drivers side the fuel filter is under the front passenger seat (under the Car)
I disconnected the fuel line at the outlet side of the fuel filter. turned on the ignition nothing no fuel
removed the back seat and found the fuel pump
then i disconected the fuel line at the inlet end of the fuel filter put a coke bottle over it to catch any fuel and when i put the ignition on this time there was fuel in the bottle and i could hear the fuel pump
when i removed the fuel filter i blew through the middle or at least tried to it was almost blocked solid
i have put on a new filter but she still wont go

so now im thinking
is there a blockage some where along the injector rail
or the injectors
if so is this a big job will i be able to do it how do i do it
could there be a problem with the pump even though it apears to work ?
could there be a problem with the fuel acumulator if so how do i check
or is there something else i havent thought of
please help i am going to donnate when i get paid