Fuel Pressure Regulator Vacuum Hose

Is there sure a beast in the Aveo 1.6l? I want to run an onboard O2 sensor test and one stage of the test talks about removing the "fuel pressure regulator vacuum hose". Is there another vacuum hose I can use to vary the air/fuel mix ratio to see how it impacts the O2 sensor?

Thanks!

I can't find it either! There's got to be one.

The car uses a returnless fuel system, which means the fuel pressure regulator is located inside the gas tank and there is only a fuel feed line and no return line. I dont think you will find a vacuum hose for it.