Refueling Control Valve: Testing and Inspection
Fuel Tank Vapor Control Valve TestSpecial Tools Required
Vacuum pump/gauge, 0 - 30 in.Hg A973X-041-XXXXX
Float Test
1. Make sure the fuel tank is less than half full.
2. Remove the fuel fill cap to relieve the fuel tank pressure, then reinstall the cap.
3. Remove the fuel pipe cover. Disconnect the fuel tank vapor recirculation tube (A), and connect a vacuum pump to the tube.
4. Plug the line (B).
5. Apply vacuum to the fuel tank vapor recirculation tube (A).
- If the vacuum holds, replace the fuel tank vapor control valve.
- If the vacuum does not hold, the float is OK. Do the valve test.
Valve Test
1. Make sure the fuel tank is less than half full.
2. Remove the fuel fill cap.
3. Remove the fuel pipe cover. Disconnect the fuel tank vapor signal tube (A).
4. Disconnect the vacuum hoses (A) from the EVAP canister (B), then plug the ports with caps (C).
5. Disconnect the vacuum hose (D) from the EVAP canister vent shut valve (E), 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 fuel tank vapor signal tube (A).
8. Apply vacuum (1 pump) to the fuel tank vapor signal tube (A), then check the vacuum on the pump in step 6.
- If the vacuum holds, replace the fuel tank vapor control valve.
- If the vacuum is released, the fuel tank vapor control valve is OK.
9. Disconnect the fuel tank vapor recirculation tube from the EVAP canister, then cap the port on the canister. Reapply vacuum (80 pumps).
- If the vacuum holds, replace the fuel tank vapor control 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.