An obvious question, but did you check the fuel pump relay?
Unrelated to the relay, my 1990 740 Rex-Regina inexplicably died one day pulling around at a Sonic. I rolled it to a parking lot and the ignition did not work. No crank. No nothing. It was very weird. After 15 minutes, I called a tow truck but then I decided to try it one last time it fired right up. Never happened again, never figured it out. I got rid of the car and went back to the Bosch injection system in my 95 940. I think Regina Systems are cursed/haunted. Nothing but trouble for me.
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