saab 9-5 1999 fuel pressure sensor

there is a fuel pressure pump ,fuel pressure regulator ,& a relay ,what do u want to check ,well anyway first check your fuel pressure using a fuel pressure gauge ,if u get 40 lbs pressure then u r good there lower u have a weak pump ,if u get 40lbs of pressure but it does not hold that pressure or it drops off real fast then u also have a bad pump ,if u get no pressure reading at all then u will need to check electricals for power or blown fuse ,post back soon good luck.