Valve Test

Make sure the fuel tank is less than half full.
Remove the fuel fill cap.
Disconnect the fuel tank vapor signal tube (A).

Fig 1: Disconnecting Fuel Tank Vapor Signal Tube
Disconnect the vacuum hoses (A) from the EVAP canister (B), then plug the ports with plugs (C).

Fig 2: Disconnecting Vacuum Hoses From EVAP Canister
Disconnect the vacuum hose (D) from the EVAP canister vent shut valve (E), and connect a vacuum pump to the vacuum hose.
Pump the vacuum pump 80 times.
- If the vacuum holds, go to step 7.
- If the vacuum does not hold, go to step 10.
Connect a second vacuum pump to the fuel tank vapor signal tube (A).

Fig 3: Connecting Second Vacuum Pump To Fuel Tank Vapor Signal Tube
Apply vacuum (1 pump) to the fuel tank vapor signal tube (A), then check the vacuum on the pump in step 5.
- If the vacuum holds, replace the fuel tank vapor control valve (see Fuel Tank Vapor Control Valve Replacement ).
- If the vacuum is released, go to step 9.
Fill the gas 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 function is normal.
Fig 4: Checking Fuel In EVAP Two Way Valve & Fuel Tank Vapor Recirculation Hose (1 Of 2)

Fig 5: Checking Fuel In EVAP Two Way Valve & Fuel Tank Vapor Recirculation Hose (2 Of 2)
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 (see Fuel Tank Vapor Control Valve Replacement ).
- 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.