Thanks for the replies and help. It seems kind of distressing that my resting fuel pressure would be less than half the recommended psi. I replaced the fuel filter two years ago, and will probably do it again now, but I do not suspect that to be the problem. Regarding the pressure regulator, I recall replacing that as well, and may do so again, just to be safe. Nonetheless, there is no change in pressure when I remove the vacuum line from the regulator while engine is running. Seems to be a strong vacuum present at that point. There is no visible gas leakage at the regulator or vacuum line, so I do not suspect the regulator to be bad. I just think the fuel pump is not getting the job done....