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 fuel tank pressure, then reinstall the cap.
3. Disconnect the fuel tank vapor recirculation tube (A), and connect a vacuum pump to the vapor recirculation tube.
4. Plug the line (B).
5. Apply vacuum to the fuel tank vapor recirculation tube.
- 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. Disconnect the fuel tank vapor signal tube (A).
4. Disconnect the vacuum hoses (A) from the EVAP canister (B), then plug the ports with plugs (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 10.
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, go to step 9.
9. Fill the fuel tank with fuel, then check for fuel in the EVAP two way valve (A), and fuel tank vapor recirculation hose (B).
NOTE: At either location, tiny droplets of fuel are normal.
- If fuel runs out of the hoses at either location, replace the fuel tank vapor control valve.
- If the fuel does not run out of the hoses at either location, the fuel tank vapor system is OK.
10. Disconnect the fuel tank vapor vent tube from the EVAP canister, then plug the port on the canister. Reapply vacuum (80 pumps).
- If the vacuum holds, replace the fuel tank 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.