i have a '98 Sunnybrook 30 DB. when i try to fillthe water tank it pressurizes and does not take water well. OK seems like a plugged vent.

but when i turn on the water pump, water shoots out the city water connection full blast. i haven't pulled the couch yet but crawling around under there i was unable to find and check valve between the pump and the city connection. the city connection is just "teed" in between the pump and the rest of the trAIler.

what gives?

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'98 Sunnybrook 30DB
'86 F350 CC 4x4 diesel