Does the Flex have a replaceable Fuel Filter? - Ford Flex Apr 17, 2011Looking at 30K maintenance items. The Flex's sch'd maintenance book says replace fuel filter at 30K. I have heard that the Flex (and most Fords now) do not have a fuel filter, or the fuel filter is internal and not replaceable.CHECK FUEL FILL INLET MessageAug 20, 2018Fuel Pumps - Ford Flex ForumNov 19, 2017Fuel filter. Ecoboost engine article.Oct 19, 20142010 Ford Flex Specifications See more results Fuel Filters for Ford Flex for sale | eBay FORD MOTORCRAFT FUEL FILTER FG 877. 93-94 Ford Taurus V6-182 3 OHV. Flex Fuel Vehicles. These have 5/16" inlet and 3/8" outlet tubes (the ring on the 5/16 side will probably allow you to put a 3/8 hose on that side also and clamp it).