Evaporative Emissions System: Testing and Inspection

1. If the fuel-vapor vent line is clogged or damaged, a fuel-vapor mixture escapes into the atmosphere, causing excessive emissions. Disconnect the line at both ends, and blow it clean with compressed air. Remove the filler cap from the filler pipe and check to see if there is evidence that the packing makes improper contact to the filler pipe.
2. The overfill limiter (two-way valve) installed on the vapor line between the EVAP canister inlet and fuel tank outlet should be checked for correct operation.