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This could be a bit tricky. IIRC this, at least in the US, is an M104 but with CIS-E injection. Given the circumstances of the failure, immediately I would think fuel pump relay. BUT again, I think this might not have one, isn't the fuel pump controlled by the MAS relay? Hmmmm. I have even replaced a few MAS relays but has been a while. Can you run a meter or test light to the fuel pumps? I know you say it has pressure but is it enough? Might be easier to just check for power to the pump instead of pressure.
Early 90s are just a bear for info, every year or 2 there were major changes.
Gilly
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