Phunk - you know I had that black plastic/tar/rubber stuff in my fuel pump housing too. Noticed it when I did my pump. I have also noticed it in a few customer cars at work when doing fuel pump related repairs. Still not sure what it is either, but I'm pretty sure its coming from bad fuel/contaminated fuel. I can't think of anything else that would cause it.
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2013 370z Nismo Turbo
2017 Lexus IS200T F Sport (DD)
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