It's a vacuum hose. With it disconnected like that, it should idle like crap.
The other end should not be hard to find (shouldn't have gone far), unless some goober decided to rip it out and cap the other end.
That's not a regulator. The regulator for the GTO is in the fuel tank. That item is a pulse dampener that is like a shock absorber for the fuel rails.
I believe he is asking for the vette in his sig.
mods=408 iron block,SDPC cnced ls3 heads,11.1 comp.,vic. jr. intake with a 4150 tb., 231/242 cam,pacesetter lts and a Complete Street Performance tune and an A_VAS build. (506/468 old set-up with a few problems.New numbers to come.)
I think all LS motors are the same. Fuel pressure regulator in or at fuel pump, pulse dampener on fuel rail. The pulse dampener looks like an old fuel pressure regulator so it's confusing. An old fuel pressure regulator does both.
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