Does anyone know if there is any special name (if there even is one) for that Y-shaped hose that goes from the air intake to the fuel regulator and the engine? I was just recently looking at some underhood pictures and realized that the person who owned my Civic before me took that hose out, put a screw into the fuel regulator where the hose went, and put a normal hose between the air intake and the engine. Is it possible to get it from a parts store, or is this something that I'll have to get from a junk yard?

 

It's just a vacuum hose, generic stuff from any parts store. It's important to have it hooked up for proper fuel pressure. Take the screw out and see if fuel leaks out, if it does the regulator is bad.

On a 1993 I think it should go only from the intake to the regulator, a simple straight hose. As for lines that go to the engine, the connection to the valve cover should be before the throttle plate. The connection to the PCV valve has its own (larger) nipple on the intake manifold. Sometimes if you put a DX manifold in an LX or EX you need a Y fitting to hook up the cruise control.

 

You wouldn't happen to have a large under hood picture of an EX would you, tried googling t, but all of them were heavily modified.

 

There no Y in the stock vacuum hose - straight from the IM to the FPR.