1. Remove the fuel pump stop switch. (See FUEL PUMP STOP SWITCH REMOVAL/INSTALLATION [AJ (3.0L Duratec)].)
2. Verify that release switch of the fuel pump stop switch is pushed.
3. Hit the fuel pump stop switch slightly and verify that the release switch does not pop up.
4. Shake the fuel pump stop switch hard and verify that the release switch pops up.
1. Disconnect the negative battery cable.
2. Disconnect the fuel pump stop switch connector.
3. Inspect the resistance between the fuel pump stop switch side terminals 1-2.