Difficulty Refueling: Insight

Test ORVR vent shut valve. See SYSTEM & COMPONENT TESTING article.
Inspect ORVR signal tube between fuel pipe and ORVR vent shut valve. See SYSTEM & COMPONENT TESTING article.
Inspect ORVR vapor vent tube between EVAP canister and ORVR vent shut valve. See SYSTEM & COMPONENT TESTING article.
Check EVAP canister.