For those of you who have been breathlessly following the saga of Suzi, my 2.0, here is, I hope, the final update in this chapter.
About 2 years ago, a noted SoCal shop replaced the fuel tank. Since she was a racer then, delete charcoal cannister and related plumbing. Tank vents? Just cap them off.
3 weeks ago, gas gauge stopped reading past half full. Read the posts, fix the sender float. That's when fuel pump problem surfaced. Car would run great for half an hour, then quit. No sound from fuel pump. Let sit for a while, all better and drive off, for another half hour. Fry a couple of fuel pump relays, but fuse doesn't blow. Try everything, well almost.
Turns out the lack of venting in the tank eventually created enough vacuum the pump starved and quit. It never was a problem before, since apparently the sending unit had just enough of an air leak to let it breathe. I fixed that
So I vented the tank, and all is well in Mudville again today, anyway. Moral of this story? I have no friggin idea.