Mitch, I think the answer is yes (yes, you would not get a CEL for it). You would minimally need to keep a manifold vacuum source (with check valve) connected to the LDP line to avoid the code from the LDP. The small section of hose that is needed to satisfy that is highlighted below:



I think you may be able to avoid EVAP "flow" codes by making sure the N80 remains plugged in and connected to the fuel tank line. The valve just vents into the fender. I don't think the ECU is looking to see that the fuel vapors actually enter the manifold. I'm not positive, but I believe it is just looking to see the tank pressure drop at a particular rate upon opening the N80. Somebody else might have a better answer for you there, but that is my best guess. It's bugging me a little bit that I can't be sure about this, so I'll probably look it up later.