Amazon: duramax water sensor Amazon: duramax water sensor. Skip to main content. APDTY 015222 Water In Fuel Sensor Wrench Fits 2001-2012 Chevy GMC 6 Duramax Diesel Fuel Water Separator Filter (Removes Sensor Part APDTY-015323, 12639450, 97384931) by APDTY. 4.5 6 Duramax Fuel Filter Replacement & Water-Separator How to replace the fuel filter and drain the fuel water separator on a 6 Duramax. Covering 2001 to 2016 model year, these procedures detail removal and installation of a new fuel filter on any 6 Duramax diesel in addition to draining the fuel water separator.