Valve Test
- Make sure the fuel tank is less than half full.
- Remove the fuel fill cap.
- Remove the fuel pipe cover. Disconnect the fuel tank vapor signal tube (A).
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- Disconnect the vacuum hoses (A) from the EVAP canister (B), then plug the ports with caps (C).
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- Disconnect the vacuum hose (D) from the EVAP canister vent shut valve (E), and connect a vacuum pump/gauge, 0-30 in.Hg, 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 9.
- Connect a second vacuum pump/gauge, 0-30 in.Hg, to the fuel tank vapor signal tube (A).
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- Apply vacuum (1 pump) to the fuel tank vapor signal tube (A), then check the vacuum on the pump in step 6.
- 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 (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.