Canister purge solenoid valve
Before disconnecting, label the vacuum hoses so that they can be reinstalled in their correct positions.
PROCEDURE
1. Disconnect the vacuum hose from the solenoid valve.
2. Disconnect the electrical connector from the valve.
3. Connect a vacuum pump to the port to which the vacuum hose with the red stripe was connected.

4. Apply vacuum and check when voltage is applied to and removed from the solenoid valve.

5. Measure the resistance between the terminals of the canister purge solenoid valve.
Resistance: 26 Ω at 20 °C
Battery voltage Normal condition
When voltage is applied No vacuum
When voltage is removed Vacuum present
Fuel filler cap

The fuel filler cap is equipped with a vacuum relief valve to prevent fuel vapor from leaking into the atmosphere.
Test yourself
A quick Hyundai Accent quiz: every answer comes with an explanation and a link to the manual page.