So, I'm pretty sure I've got the bum wiring through my fuel pump flange problem, so I'm swapping the assembly out for another one. However, I've read on here (and other places) that I should "lubricate the fuel pump flange o-ring" to help prevent fuel leaks after tightening it down. My potentially dumb question is, lubricate it with what? I've got motor oil, dieletric grease, and WD-40, or I could go out and get something? What should it be lubricated with?