I have a recurring P0441 code...emission control system incorrect flow. This started happening shortly after I replaced the fuel filter. Is it possible that there is a leak somewhere in that hose that is causing the evap emission code? I don't smell gas or anything like that. I have had the purge valve replaced a couple of years ago, thought it unlikely that it's bad again. Also, the gasket on the gas cap seems OK, and I am always very careful to tighten it. Any thoughts?