Here's a pic of the fuel pump and wires.
Also the early 755 wiring diagram that includes the yellow wire to the fuel pump from the alternator.
I can't explain the mention of the black/white wire in the pic vs. the yellow wire going to the fuel pump on the diagram.
Added a third schematic labeled the "late" wiring, that just may show the connector you mention.
What is the serial number of your 755?