Would it help to put a fuel / water separator into the vent line? http://www.ebay.com/itm/Universal-Diesel-Fuel-Water-Separator-Replaces-5864-002-Thread-M14-1-5-/171859797203
The simple ones have no filter elements so would not impede air flow. They would capture water coming in. The more sophisticated ones have a water sensor, or a fitting for one. Michael Brown Windburn C&C 30-1
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