Racor Fuel Filter (2001-2016 Duramax) | DMAX Store Racor Coalescer Fuel Filter (2001-2016 Duramax) Fits 2001-2016 Chevy/GMC 2500/3500 HD 6 Duramax Diesel . Part# PFF50216. This is the latest and greatest high efficiency, long life, "depth coalescing media" fuel filter by Racor.[PDF] PFF50216 - Parker Hannifin fuel filter for the GM Duramax engine. The Racor coalescer fuel filter system contains a primary coalescing and a secondary polishing stage. The coalescing stage has multiple layers of specialized media that traps dirt and extracts finely dispersed water out of diesel fuel. The secondary filter strips away remaining water and polishes the fuel.