There is a little backflow preventer valve button just under the screen on the inlet. It may be stuck open allowing pressurized water to flow back out.
Just pull off the filter screen and give it a push to see if you can reseat it properly. (Stand to the side when you do this!)
Note that you should actually press this valve until anti-freeze flows out when winterizing anyway (making sure that AF is in the fill pipe). So that is one more step already taken care of.
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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