Just came across this thread.
Interestingly I have had what appears to be a similar problem with my 1993
190E 2 litre. I have called the RAC twice (Britain's other major motoring
organisation). For afficionados of London, once I broke down near
Parliament Square in the morning rush-hour among the roadworks which narrow
the side street, on the school run...
Nothing found. A new fuel pump relay -- previously fitted by an independent
garage -- did not solve it.
The car was taken to a Merc garage for testing. They could not reproduce
the problem, just once they said they had what might have been a cut-out.
(They didn't charge me!) Their suggestion for dealing with it cost several
hundred pounds and was not a guaranteed fix, so I left it.
It seems I could just leave the car to stand and it will restart after a few
minutes. Hasn't happened for a while, though. The car passed its MoT test
(annual British roadworthiness test) without any problems and runs well.
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