03 Santa FE 2.7 PO455 large leak
 

I would like to know if anyone has a suggestion what to check for

Pretty self explanatory with that one... system went to do a self test, kept trying and Fuel Tank Pressure Sensor did not flinch,,, stayed atmosphere pressure....

A - Fuel cap blatanly loose or missing

B - Canister Close Valve did not close/seal up system during self test, thus FTPS stayed at atmosphere pressure

C - giant hole in evap system

At dealer, we have ability to make repair, and tell PCM to perform an EVAP test and see results of test to verify the situation been remedied..

Thank you