Without more info, I'd suspect the go valve is broke.
2012 scab XTR 5.0L, 4X4 3.55 ELD, series 100 remote start, rugged liner soft tri-fold tonneau, OEM winter matts, Rigid dually floods, 2" level with General AT2 275/70/18, FoMoCo chrome band mud flaps.
2011 Fusion SEL 2.5L series 100 remote start, Halogen lamps, ambient lighting.
In the cold. Deep underground.