[wslade2]

I read Herb Harney's post of 6/12 with great interest and plan on conducting said test:
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"Let me discuss one issue that some folks have had that the new caps will not fix. In the service port of our aircraft is an overflow tube that collects small amounts of overflow and allows the fuel to exit under the wing. These small tubes are also suppose to drain any water that may try to collect in this service port when the aircraft is stored in the elements. Everyone should test these drains to be sure they are not broken or cracked. If they are compromised you will not know unless you try this test. Take a small amount of fuel and pour it into the service port, with the fuel cap on, while the bottom of the tube under the wing is plugged. Either have someone pour the fuel while you hold your finger under the tube under the wing or plug the tube with something that will not harm the pipe. If the fuel pools in the service port then the tube is sealed and working correctly. If the fuel drains from the service port then there is a crack or the tube is broken inside the tank. This is how the water intrudes into the fuel cell. I have personally seen this on my airplane and have read from others that this has happened. In fact it was determined that the Skymaster departing Point Lookout in Branson, MO had this very issue. Check your tank drains folks and if you have a problem be very careful when you leave your aircraft in the elements."
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Herb R Harney
1968 337C
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Also was not aware there is a Monarch fuel cap modification
The earlier part of the thread also discusses the maneuver to be sure tanks are empty of all water and plan on doing that before next flight.