Purple ashes

Does anyone know the layout of the EVAP system on our cars? My hose that goes from the EVAP purge valve to the manifold is "pinched" up like its trying to breathe, i tried several known good hoses and they all seem to pinch up, with the hose off, there is vaccum going into the manifold so im assuming somewhere along the evap lines something is clogged preventing full air going into the manifold? TIA