Re: gas cap leak
1933-34 originally used a NON-vented cap which sealed the fill neck opening. Locking gas caps by their nature are vented and will spill fuel. Confusion abounds about the replacement caps in part due to Ford in the "Green Bible" back interchanging the later vented cap to 1932.
The Drake tank should be vented on the top (usually in the pickup tube area). With a non vented cap and a non vented tank and a strong fuel pump you can make a 12 gallon tank into a 2 gallon tank (Our family did it on a '68 Plymouth wagon).
My guess is the wrong cap.
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