I think our fuel pressure is around 43 psi, or something, but how strong is that in terms I can relate to?

I replaced my FPR the other day, only to find myself with a fuel leak and after examining it, it was coming from the FPR->Fuel Rail line and dripping down the bottom screw. I was examining how it all goes together and it seems unreal how it would be leaking, I mean first it was very tight with the screws and second the line goes in a good 3/4" with an intact o-ring about a 1/2" in. How could that possibly leak?!

Anyway I sealed it up with some Blue RTV and am going to try it out tomorrow to see if that fixed everything