JohnZo, I'd say you nailed it!
Just dodged a bullet! Almost had to get towed home again, from the SAME place as last time… SPECS liquor. Had a moment of clarity and figure out it was the fuel pump harness. Scrapped the pin as best I could and she fired up and I’m back home ordering a new fuel pump harness!
Not to see if I can figure out why it burned the connector.
Thanks,
dcphotos

didn't look that burnt last week...

 

Glad you found the problem! Why do electrical connections burn? Simple answer is because current flows, and resistance increased, generating power at the connection. Heat is generated by electrical power, power is amps (squared) X resistance. Every electrical connection has very little resistance, so very little heat is generated. The amps are controlled by the load (fuel pump motor in this case), so amps are fairly constant. Corrosion or loose contact causes resistance to increase, leading to more heat, leading to burned plastic around the hot metal parts. Note amps are squared in the formula, so doubling amps creates 4 times more heat. That is why high amp loads are more prone to problems.

Most house fires in the US are caused by this same issue. That's why it is good to unplug and replug lamps and heaters (especially higher amp loads) and such once in a while. That way the brass parts get wiped clean for better contact. For automobiles, probably the most common cause for plugged connections becoming loose is getting jammed together when the two sides are not quite straight in line. Once heated up that much, the gripping force can become weak as well, if heat effects the metal that way. Then it gets even hotter (run-away condition).