Valve Test

1. Make sure the fuel tank is less than half full.
2. Remove the fuel fill cap.




3. Remove the fuel hose joint protector. Disconnect the ORVR signal tube.




4. Disconnect the vacuum hose from the EVAP control canister, and then plug the port with a cap.
5. Disconnect the vacuum hose from the EVAP control canister vent shut valve, and connect a vacuum pump to the vacuum hose.
6. Pump the vacuum pump 80 times.
- If the vacuum holds, go to step 7.
- If the vacuum does not hold, go to step 9.




7. Connect a second vacuum pump to the ORVR signal tube.
8. Apply vacuum (1 pump) to the ORVR signal tube, then check the vacuum on the pump in step 6.
- If the vacuum holds, replace the ORVR vent shut valve.
- If the vacuum is released, the ORVR vent shut valve is OK.

9. Disconnect the ORVR quick disconnect from the EVAP canister, then plug the port on the canister. Reapply vacuum (80 pumps).
- If the vacuum holds, replace the ORVR vent shut valve.
- If the vacuum does not hold, inspect the EVAP canister vent shut valve O-ring. If the O-ring is OK, replace the EVAP canister and repeat step 4.