99 Blazer when is the fuel psi supposed to be checked?

Hi, I have a 1999 Chevy Blazer with 121,000 miles on it. It has a 4.3 liter engine, automatic transmission and 4 wheel drive.

Hi, I was on here alittle while ago and I was asking about my fuel pump and I got a new one, but my car still wont start and I'm trying to figure out what psi reading I'm supposed to be looking at. Do I look at the psi when its cranking or when its just sitting there when the fuel pump kicks on?

Any help would be usefull
- Josh
P.S. Fuel pressure just sitting is around 54 and crankings about ehh 60 ish.

thanks God bless