Where is the fuel pump valve.

The pressure regulator has such a valve in it by the fuel rail. I would suggest you change the fuel filter first and look into the possibility of a failing fuel pump. A bad regulator check valve will cause unusually long crank in starting but not as you are describing. Here is a diagram for ya: http://saabworld.net/f144/fuel-system-petrol-gasoline-saab-9-5-a-1632/