No fuel delivery

I will have to do this with one of my helpers tomorrow, but, if I have no power from the orange and/or gray should I go ahead and replace the oil pressure switch anyway. I bought one a while back and realized it was going to be a PITA to replace, so I never did it. Thanks for your response!

At the relay Black/white good ground. Orange is hot all the time. Red has nothing. Green/white has nothing. Gray is hot when cranking only when oil pressure is built up. It remains lit with switch on until oil pressure dies off. (Changed oil pressure switch anyway due to former erratic oil pressure readings)
Sure hope this gives a little more information you need. Thanks for the replies.

Thanks for the response. I am a carpenter, so this mechanic thing has me stumped. I could tear down and rebuild 265's and 283's, even an occasional powerglide when I was much younger, but this new stuff. Well I gave up.
Would there be any fuses other than those on the fuse panel under the dash that supplies the PCM. Where is the PCM located? I have a wide sandwich size unit mounted next to the master cylinder vertically. Is that it? Oh, yeah, I am getting a 54 code on the OBD.
I really appreciate your patience and information.

Well, I did all the testing I could do without actually pulling the tank and the fuel pump. So I checked with my local mechanic to see who he used for a tow service, and he suggested I turn on the ignition, tap on the tank in the middle with a rubber mallet. I always knew there were smarter people in the world than me. It worked, and so far so good. I know I am on borrowed time, but at least it is working for now. Thanks for all the help. Just thought I'd pass this scientific method of diagnosis along.