Replaced my EVAP system today (canister, shield, CVS & all lines out of canister....smoke tested prior, all failed smoke test even though PCM had passed it for OBDII IM Readiness but Mode 6 EVAP test result data showed a positive number just inside the max threshold instead of a negative number indicating a faulty system that was about to fail the .040" EVAP leak check test....had already replaced leaking EVAP CPV found thru scan tool live data, gas cap due to age & replaced bad aftermarket TB & brake booster check valve that failed induction smoke test prior), last of the vacuum leaks found from smoke testing induction system & EVAP system. In the process of replacing bad EVAP system found that the existing system was NOT the original EVAP system for my car (PO had installed a junkyard Ford EVAP system from a different Ford vehicle class due to damaging the original unit...bolt pattern was different so sheet metal screws were used to mount it instead of the OEM studs\11mm flange nuts)....all back to proper OEM EVAP unit now & mounted correctly using all proper OEM mounting hardware. Both the EVAP CPV & CVS tested working but would not seal off anymore along w\ a failed flex line off EVAP canister that attached to the CPV line thus causing unmetered air to enter induction system so will need to have tune rechecked (mainly the OL fuel mapping which is used for part throttle\WOT operation since this was tuned w\ unknown unmetered air existing in system).
So as of now have all systems on car refreshed & up to snuff so my 11 yr old 153,000+ mi Stang is in as new condition w\ no external vacuum leaks anywhere & all systems fully operational so should be good for a good long while.