#620, "RE: HRC turbo fuel system (Check valve and fuel mapper)" In response to In response to 5
In fact, HRC does include one.
I wouldn't say it's an essential piece, but what it does is provide an out for the boost after it goes through the adjustable FPR. (The extra signal sending air/boost needs an out.) So here's where the check valve sits: The vacuum line runs from the intake plenum to the adjustable FPR, and then the FPR has a vacuum line that runs off of it to the check valve. If you didn't have a check valve here, it would be like a small vacuum leak in your system.
Now, I'm not sure if the Vortech requires one, but a HRC adjustable FPR (Bell) certainly does.
Jason 98' Eagle Talon ESi-T Mitsu Super 16g Turbo(HRC)