E597283 -
Sounds like the dreaded "vacuum breaker valve problem" to me. This topic has many threads throughout the Forum. My advice is to use the "Search" option on the above title bar and simply search on "vacuum". These valves are found in various places, like up under the lavatory sink and accessible to buried inside a will and inaccessible. Sometimes they are damaged, sometimes have a bug lodged in them, sometimes mounted backwards, sometimes not winterize and cracked, and most times just work. Do the search, you will see.
Ron
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2011 Alpine 3640RL (Beauty)
(Gone! Now replaced by Beauty3)
2016 Ford F-450 (The Beast)
Diesel 4x4, DRW, LB, CC
Comfort Ride Hitch
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