The electrical connections for the fuel pump module are on the driver’s side under the rear seat. There are two multi-pin connectors and a ground strap. They feed through a big rubber plug down to the tank. It does not appear that there is any way to feed power to the pump (to hotwire-test it, etc) because these wires all go to the fuel pump module/controller (which is mounted on top of the tank under the driver’s rear seat). It doesn’t matter, because I found out through trial-and-error that this is some kind of funky pump which actually has 3 wires controlling it. The 2 big lines are the power and ground of course, but there is a third small (signal?) wire which maybe controls some kind of valve or something? If you hotwire the pump directly you can hear the pump run like crazy but it won’t output anything – it appears to need the fuel pump controller to feed something into that third wire before the pump will put any fuel out on it’s output line. Weird.
Also I looked high and low but was unable to find out anything about this pump. It doesn’t have any branding on it at all. I took some pictures of the numbers in case someone else decides to try to track something down. 
IMG_2830 by joel.dunham, on Flickr
IMG_2831 by joel.dunham, on Flickr
IMG_2829 by joel.dunham, on Flickr
I did find this guy (in Russia?) struggling with finding a pump also
https://translate.google.com/translate?sl=auto&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fwww.drive2.ru%2Fl%2F4590812%2F&edit-text=&act=url
Also this looks like the right pump but you have to buy 500 (!!)
https://yinhao.en.alibaba.com/product/1226669508-50087189/Crylser_Electric_Fuel_Pump.html#!
I decided that I would get the car running on the new pump before I actually installed it in the tank and put everything back together, because putting the tank back up by myself seemed like it was going to be an annoying job (spoiler: it was). So I connected the pump to all of the inner-tank workings and (after a brief scare when I forgot to connect the pump ground… doh!) got the car running with the new pump all hooked up to the fuel lines and electrics of the car, but sitting in a jug of gas next to the real fuel tank. I was now convinced the car was going to run on this tank so I could put everything back together.
Here’s the tank laying on the floor:
IMG_2839 by joel.dunham, on Flickr
Here it is with all the hoses pulled out getting hooked up to the new pump for testing:
IMG_2841 by joel.dunham, on Flickr
I also got a couple of (pretty bad) shots of whatever that thing is mounted inside the tank. Looking at the wiring on the inside of the tank I’d say there is another level sender in the driver’s side of the saddle tank, and I think this thing mounted in the passenger’s side of the tank (with the main pump) is some kind of electric ejector pump to move fuel from the other side of the saddle tank. The ejector pump in my 1998 ran on the pressure on the return line from the pressure regulator. I’m not sure this car has a pressure regulator, again maybe this is related to that third wire on the pump. There is only one fuel line leaving the tank so this is a ‘return-less’ system.
IMG_2834 by joel.dunham, on Flickr
IMG_2837 by joel.dunham, on Flickr
more to come later.