well there is a good chance your vaccum operated fuel pump isnt working for some reason.the panel that goes between your knees as you sit on the bike has a fuel pump and a secondary fuel header tank ,i would take this panel off and check the pumps pipes are all connceted and that the fuel opump is working,also the air pipe that supplies the fuel pump with its suck/blow air supply is situated on the side of the inlet manifold on the left at the front .if this has fallen out or is loose it will also cause your fuel starvation problem .
adam bike doctor (of milton keynes motorcycle centre), December 2010
