On my 2.5L V6 Sonata, there is a fuel pressure regulator mounted at the fuel rail fuel input output.
That regulator is operated by manifold vacuum, and that vacuum connection is via a small, short hose. Well, that aged and got hard, brittle, and didn't seal good enough the vacuum. That lead to fuel pressure issues and codes...
I have replaced with a 6" vacuum hose, from Advance Auto Parts, the guy didn't even charged me for it.
Yep, my mistake.
Long time ago I actually replaced that input flexible rubber hose because it started leaking gasoline, I should had remembered.
PS: Hyundai dealership didn't have one in stock, but Kia had one that was identical.
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