If it looks like there is sensor attached near or at the bottom of the fuel filter housing or collection bowl, then you probably have a WIF (water-in-fuel) sensor which should alert you up at the driver's seat in some way. If no sensor, then you probably have to check periodically like others have mentioned.
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E.S.P.
'07 Rockwood 8281SS 5th Wheel
'07 Silverado 2500HD LMM Duramax Diesel / Allison 1000 CC 2LT S/B
Reese 15K 5th Wheel Hitch w/ Kwik-Slide
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