The idea that it was the fuel pump(s) came from the tow truck driver.

I finally spotted the serpentine belt, noting that it was a "little on the thin side." In other words, it had broken longitudinally, leaving a narrow belt intact, but with the portion that had broken off wrapped partially around the viscous fan clutch. The loose end had (evidently) pulled the primary ignition cable off of the distributor -- i.e. no spark. I thought that the theory of "bad fuel pump(s)" made sense because I had disconnected the front injector supply, cranked the engine, but no fuel came out. I later saw that other cars (300e) had relays and fuses that COULD potentially cause a "no fuel delivery" condition. When I went to look for fuses and relays, I spotted the bad belt and ignition wiring disconnected.

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Jeff Naumann
Torrance, California
1972 220D 138k miles (sold)
1982 300SD 263k miles
1989 BMW 750iL 183k miles
1993 Dodge D250 Cummins 5.9 202k Miles