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Then there is an obstruction in the outlet, obviously. No one can tell over the internet exactly how it is obstructed; therefore you'll have to investigate yourself...
Unless you're asking if there is no hose connected, should fluid drain out? I don't understand your post..."is should fluid drain out"
Mine did the same. Take each section of hose off and blow air through them. Unscrew the metal nozzles under the cowl. Clean these and blow air through. Dirt gets trapped in these and causes blockage.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.