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I had a similar situation with my 1966 337A. After all tanks were topped-off, aircraft was parked for a day. Returned to find a significant amount of fuel was missing from the main tank and the aux tank was over flowing through the vent.
I ran the airplane a few minutes on the ground from the aux tank and exercised the fuel valve. The leaking stopped and so far has not returned. I don’t know for sure but think the fuel valve must have been slightly out of position possibly allowing fuel from the main tank (higher elevation) through the valve into the aux tank causing it to overflow.
Steve
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