Evaporative Emission Symptom Chart: Notes

EVAPORATIVE EMISSION SYMPTOM CHART

Problem	Possible Cause	Action
Leakage In The Evaporative Emission (EVAP) Canister or Canister Vent Solenoid	Canister vent solenoid stuck open. Weld seam leaks. O-ring seal leaks.	See PINPOINT TEST 1: EXCESSIVE FUEL ODOR .
Blockage In The Evaporative Emission (EVAP) Canister Or Canister Vent Solenoid	EVAP canister blockage. Canister vent solenoid blockage. Canister vent solenoid output hose blockage.	See EVAPORATIVE EMISSIONS SYSTEM PINPOINT TEST 2: HISS WHEN OPENING FUEL CAP .
Unable to refuel the vehicle	Damaged fuel filler pipe. Damaged canister vent solenoid. Damaged fuel vapor valve tube assembly.	See EVAPORATIVE EMISSIONS SYSTEM PINPOINT TEST 3: UNABLE TO REFUEL VEHICLE .