Is fuel pressure regulator supposed to have its vacuum hose provide a "suck"

[calzate]

My car has failed the fuel pressure regulator test where you disconnect it and hope for a change or increase in idle. This did not happen for me but i noticed the vacuum going into the fuel pressure regulator feels like no air is going through.

Thanks

[Eric93se]

I'm pretty sure the idle raising when unhooking the regulator is not a test. You would expect a change in fuel pressure.

[calzate]

I'm pretty sure the idle raising when unhooking the regulator is not a test. You would expect a change in fuel pressure.

you are correct