In the middle of my '86 GLHS fuel pump replacement. I have a few questions and want to make sure I'm not screwing things up too badly.

Here is a gallery of photos detailing my questions:

https://imgur.com/gallery/wrVOznQ

An overview of the questions:
1.) The original rubber gasket melted to my fuel pump. Do I need to replace that or is it fine with the new white plastic piece in the last picture?

2.) Am I putting the new pump together correctly?

3.) There is a melted piece of hose near the bottom of my harness. What is it, and how Do I replace it?

Thanks!

Bryan