inetd:
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When warm air vents into a half-full fuel tank, it meets the cooler fuel and quickly condenses, releasing moisture either in a sublimation or vapor to solid form
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Where's the warm air coming from????????
When my car sits in my driveway at -35C, the fuel is at
- 35C, the fuel tank metal is at -35C and any air coming into the tanks from the vent is at -35C. In our climate, you don't replace the volume of burnt fuel by warm air. Water condensation will only occur when and if warmer air containing moisture comes in contact with a cold surface (fuel or fuel tank walls).
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when cooler air holding very little moisture contacts warmer gas, it's no big thing
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Exactly my point. If the fuel is being warmed (by circulation through the fuel injection system or other source of heat) and colder (dryer) air gets into the tank, replacing the volume of fuel consumed, it's no big thing.
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luckily for me the MB design left the fuel pickup slightly higher than the bottom of the tank
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This is not a MB proprietary design as all car manufacturers have been building their fuel tanks this way for ages.
Most of the water contamination seen in fuel tanks comes from distribution terminals and service station tanks, not from condensation in the car's tank.