There is a "one way valve" located inside the city water connection. It is designed to close to prevent pressurized water from the water pump from flowing out the city water connection. You may be able to remove the screen and "wiggle the plastic post" to reseat the valve. If the O-ring is displaced, you'll need to replace the city water connection. If you're in warranty, talk to your dealer, he should fix it or give you the part to fix it yourself. If you're out of warranty, a city water connection is about $5-15. Buy some butyl putty tape when you pick up the new valve.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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