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The 103 has an engine speed sensor on the front of the block that supplies the so-called TDC signal to the tach and EZL. I think that's what sptt may be referring to, although that's not the CPS. If the signal from that speed sensor is interrupted for as little as 1 second, the fuel pump relay shuts off power to the fuel pumps. It's like someone reached over and switched off the ignition key. That's a safety measure to stop fuel flow and prevent a fire, in case the car has been involved in a collision and that's the reason the engine speed has stopped, even if, as in your case, the engine speed hasn't stopped at all, but just a malfunctioning speed sensor. Sure sounds like the symptoms you're describing.
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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member
Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'
There are only 10 kinds of people in the world--those who understand binary and those who don't
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