Thank you to Phil and the others for your helpful comments. Can I access
the "inlet sock" that is probably clogged, by pulling out the internal fuel
pump form the gas tank? In other words, will it be attached to the end of
that assembly? And then, can't I inspect the innards of the tank from that
fuel-pump assembly hole? (I already loosening that lock-ring and can easily
pull it out)

I'll do my best on the fuel filter you mentioned, underneath by the
external fuel pump.

I definitely want to bleed the fuel rail and make sure I'm getting clean
gas up to the injectors. The "fuel rail" runs along the four injectors,
right? What is the best point to open up the fuel rail for bleeding? Thanks
for your help!

Yeah, I know, sitting cars disintegrate. This one couldn't be avoided (I'm
surprised I didn't disintegrate during those five years!). I've worked on
old trucks and cars, but don't have much experience with fuel injection
cars. I have the Haynes 240 series (1976 thru 1993) manual, which has
diagrams and sections all over the place.