I'm embarrassed to have to ask this, but I lost track of what a vacuum nipple on the back of the top Intake Manifold connects to. I'm just reassembling the engine after replacing the fuel injectors, and I'm stuck.

I've checked the FSM and Courtesy Nissan's parts diagrams. The hose that fits this connection is labeled "Hose, Vacuum Control B" on Courtesy's 223 vacuum piping diagram. But another hose coming from a control relay has the exact same label, and THAT hose is the one I've marked going to the Power Valve Actuator nipple.

The nipple I'm referring to is located between on the back left corner between the PCV valve and the large vacuum connection to the Brake Booster. Here's a diagram:


Can anyone help me out? This is a VG30E engine in my 1990 Maxima SE.

 

That one goes to the fuel pressure regulator.

 

Ah Yes! many Thanks! I kept looking for open vacuum connections, but I had the upper manifold sitting loose on the lower section, and that blocked the view of the fuel pressure regulator on the end of the FI rails. I DID remember this connection was something vital - this is the 3rd time I've done this, so I only marked a few connections. But it had been a while since the last time, and my memory wasn't as good as I thought.