fuel rail/pump pressure test 

2001 f250 6.8l fuel pressure test. The test/bleed off port is on the passenger side fuel rail
recommend pressure on a 6.8l v10 is 28-40 psi with the vaccum line on regulator.
you could also test the fuel line pressure between the fuel pump and the fuel regulator. there is a hose splice adapter with the test kit. but Im going to skip all that and replace the fuel pump