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. 6.6 duramax fuel filter | eBay Find great deals on eBay for 6.6 duramax fuel filter. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Shop by category. Enter your search keyword GMC Duramax 6.6 Fuel Filter 2017 -2019 Baldwin PF46126 TP1015 WF10451. Brand New. $23. Buy It Now. Free Shipping.