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Check your running fuel pump pressure. If (as I suspect) it's too low, first try changing your fuel filter. After changing the filter, recheck the running fuel pump pressure. If still low, check you fuel pump pressure regulator. If OK, you may need a new fuel pump.
Also probably would be a good idea to replace you air filter.
First, confirm that the fuel filter is clean. Next determine that the electric fuel pump (usually located in the fuel tank) is operating. You can do this when you check your fuel filter. With the filter out, turn on the ignition (DO NOT CRANK THE ENGINE). The fuel pump should run and fuel should flow out of the fuel filter holder .... or the fuel line if it is an inline filter. Be extremely careful and have somebody help with this test because you could be pumping raw gasoline into the engine compartment and on the ground. If the filter is clean and you are getting fuel out of the fuel line then the problem could be an engine computer or the fuel injection system.
Your volkswagen has an external fuel pump under the car near the tank... the filter shold also be mounted there... They are on a timer, they will actuate during engine cranking... Have someone crank the engine (as in trying to start it) and you should be able to hear the pump operate... if it doesn't , check for power with a test light... the polarity is typically marked on bosch pumps... if you have power, and no pump sound.... u need a pump. CIS injection systems turn to **** when they sit a long time, drain the tank (alot of german cars have drain plugs, or take the hose at the pump off and put fresh fuel in it...
CRACK LOOSE THE INJECTION LINES 2 OR 3 OF THEM WILL BEEN ENOUGH. TURN THE ENGINE OVER TILL FUEL STARTS PUMPING A LITTLE BIT. THEN TIGHTEN THE LINES. IF ENGINE STARTS WEHN BLEDING THE LINES SHUT IT OFF. AFTER LINES ARE TIGHT START YOUR ENGINE THE REST OF THE LINES WILL BLEAD AFTER A SHORT RUN TIME.
The thing you need to do is run a leak down test on the fuel pump overnight, hook up a fuel pump test guage to the fuel injector gas rail test port, run the engine, note the fuel pressure when you shut the engine off, it should not drop more than 5 PSI overnight, if it does you need a new fuel pump. Your car doesn't use a cold start valve, that was used on very early Bosch K-Jetronic fuel injection systems, they where last used in the 80's