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Not sure on the newer models like yours but there is a drain at the service cap for the tank on my '68 that will drain any fuel that overflows during fueling. This drain is a small 1/8 inch tube that passes through the tank before exiting over board under the wing. If there is any corrosion in that tube inside the fuel tank moisture from atop the wing will pass down around the service door to the tank and drain out through that tube. If the tube is bad the moisture deposits in your fuel cell.
Just a place to check.
The photos show the door over the service port and the door open at the service port. Notice the small hole (drain) at the upper left of the photo. This is the tube that passes through the tank and exits under the wing.
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
Last edited by hharney : 02-15-10 at 06:48 PM.
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