Water in Fuel ISX

[cjcool]

We keep getting Water in the fuel code 1852 with 0418 we follow procedural fix, drain, new filter if needed, code clears , everything seems ok ... we drive in the rain and code comes back. Anyone ever heard of water entering the fuel system from outside? We have tried to figure out if any of our Fuel stations have bad fuel. Or is it simply condensation in the tanks due to our lane... warm to cold to warm... 65 Deg F to 0 Deg F in one trip. we even tried a new sensor same outcome.