Bert,
Glad to see it's not the fuel pump. I guess you don't need the pictures at this point but I already took them so here is a 3.5 fuel pump. It has 3 ports labeled S D R presumably suction, discharge and return. Here is a partially disassembled 4.5 fuel pump but you can see that there is one port on the front and one port on the side. As Al pointed out I'm sure any fuel pump with the correct pressure and flow will work if you figure out how to connect the return line.
Tony
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 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
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