EVAP leak

I have had a small EVAP leak that I diagnoses to a fitting on top of the tank. I had to put in a new tank. I thought the problem was fixed but now I’m getting a large leak code. I have been trying to diagnose by doing a smoke/pressure test. I cannot find a leak anywhere and am starting to suspect maybe the FTPS is the problem. My big problem is finding the literature to point out component locations. I believe the FTPS is on top of the tank maybe connected to the fuel pump but I’d have to drop the tank again to verify. I need some help troubleshooting this problem!

While I have been able to close the vent valve and open and close the purge valve to seal the system, there appears to be a “vapor block valve”? That I cannot find and can’t find literature to show it or explain what it is. I need help from someone who has access to this specific vehicle.