ahh911 is correct. A more accurate way would be to take the line off the bottom of the accumulator and plug it. Here is a good thread dealing with possible issues and testing.
http://forums.pelicanparts.com/porsche-911-technical-forum/1159640-fuel-pressure-testing-system-pressure-cold-control-pressure-residual-press-0-a-3.html
As for the fuel pump, could the fuel pump relay be failing?