I've got/have had that issue with mine too. Don't know if the vent is kinked or just has enough of a dip in the hose to act like a "p trap" . I'm inclined to believe the hose has a dip (low spot) in it that holds water. It would fill about 2/3 then wants to blow water back at you. Sound too familiar? I've pulled the plate and looked at the vent hose from the plate to the topside of the floor and nothing was obviously amiss. The issue has to be below the floor and hidden by the coroplast underbelly on mine,which would be a PIA to investigate further, especially since this has been working for me.
I'm using your basic Camco water bandit with the addition of a double female hose coupling. It seals to the filler neck inside lip. Once it gets 2/3 full it spits water out the vent. (I surmises that is the water trapped in the vent line being forced out by the air in the tank) Once it's full, water comes out the vent tube at a rate like you would expect. When you disconnect, some comes back out for a few seconds and all settles down. It's been working for me for the past couple seasons and no messing around with it. I've just got a piece of mechanic's wire holding it up to a tie wrap passed around a rib in the refer vent so I don't have to stand there and hold it.
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2016 Flagstaff 27VRL Emerald
14K Equalizer
2020 Silverado 2500HD CC 4X4 6.6L gas 3.73
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