Hi Bert,
Sorry to hear of your experience. Not sure if this is to obvious but did you connect a 12v source directly to the fuel pump to see if it runs? I took one apart from a 108 4.5 which is very similar and they seem bullit proof. I think they are VERY expensive but you might be able to adapt one from a 4.5 if you can find a used one. The motor is crimped together but if you find it bad I see nothing to lose by taking it apart. You might be able to replace the brushes and seals and put it back together.
Good luck

__________________
Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT