7 Power Stroke Fuel Filter Replacement Procedures 7 power Stroke Fuel Filter Replacement How to Replace Fuel Filter on a 7 Power Stroke. The 7 Power Stroke has a single fuel filter located near the front of the engine in the valley. It features a convenient drain valve and tube system that allows the housing to be drained remotely. Have a 99 f250 w/7.3 Fuel leaking with the engine running Dec 08, 2009Have a 99 f250 w/7.3 Fuel leaking with the engine running from the aft side of the fuel filter assy. Dripping off of a plastic assy on the back of the fuel filter assy. Has a line attached to it that appears to be a drain line that runs forward and in front of the right valve cover.