Alright mate
Rumors are that the standard fuel system (injectors, fuel pump, lines etc) can supply enough fuel safely to run 1 BAR (14.7psi) of turbo boost pressure
On a standard T2 unit it should be ok but then again depends on the initial turbo condontion!
when i 1st had my mk2 turbo, the actuator pipe came off the turbo and it over-boosted with the needle in the dashpod going round twice when on fuel boost! lol
Completly killed the turbo but the fueling didnt lean out or anything, pretty lucky but i dont recommend it! lol