I had posted a while ago about replacing the OEM connector at the gas flap solenoid with T&B spade wire ends. I can now say after several months testing that the OEM connector was the culprit. Before changing the connector I had cleaned and applied Stabilant, that lasted about a month then it was back to manually opening the flap. I wonder how many solenoids have been replaced when corroded terminals in the connector was actually the problem. My gas flap now opens every time.