ryans_z71

This is my first post - I have a 2003 5.3 Sierra and I am having the hard starting problems also. I have replaced the fuel pump and the fuel regulator with no luck to resolving the issue. So, I bought a pressure gauge that attaches to the Schrader valve and it registers 45 psi at idle and during cranking slowly builds to 45 psi. I read that the psi needs to be 55 at idle and 65 psi just with the ignition in the on position. Is this correct?