It sure sounds like a fuel pressure/blockage problem. I think a key symptom is the suddenness it came about with, although you might not know if there had been similar occurrences like this prior to you buying it that would make it a more gradual failure. Wouldn't hurt to ask the folks you got it from if they know anything about it.
Crack a few lines on top of the fuel distributor. If you have fuel there it may indeed be a pressure problem. If the regulator seems okay there may be a problem with the fuel distributor. For a start I'd check for blockage in the fuel inlet. In the picture above you'll see the line leaving the distributor to the regulator. On the distributor opposite that line, above the throttle linkage (not visible in the picture) is the fuel inlet. The large nut that the line tightens into is has a fine mesh metal filter built into it that can get clogged somewhat easily with fuel line gel and varnish from sitting or bad fuel, reducing flow and killing pressure before it even enters the distributor. A cheap part at the dealer. The parts guy at my local dealer said he didn't even know there was a filter there, it was the first he'd ever sold.
Might not be the problem but worth a look, especially if the car has sat.
Doesn't seem likely though that the car would suddenly die with a problem like that.