My '59 Nash say for a few months (ok, a year). I recently got it running again by changing out the spark plugs and fuel filter. We let it run for awhile, then shut it down.
That's when we noticed that the carburetor was leaking fuel from two places.
We cleaned up the fuel, then ran the engine again. This time no fuel leaked.
One of our crew guessed that the seals had dried out and shrunk with age and the fuel caused them to swell back to their proper size. Is this possible? If not, what could have been the cause?