Hi there,
I would suspect the fuel pump relay if you were driving and it just cuts out.
Normally they restart,though. You can take out the relay and then jump terminal 30 with 87. That should make the fuel pumps run and, if it is the relay, the car should start.
There is a lot in the archives, so a search might help.
Good luck

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Reinhard Kreutzer
1987 420 SEL (126)