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Vaccum in the tank


hallii

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The fresh-water tank needs to be vented to prevent the vacuum issue you've mentioned. The venting may be via the water filler-cap, or by a separate vent within the filling inlet, or the tank itself may have a dedicated vent.

 

My Rapido's fresh-water tank's inlet is near its base and there's a vent outlet near the tank's top surface. The tank can be filled to the brim when water will gush out of the filling inlet in the motorhome's side. Then water starts to siphon from the tank through the vent via a narrow-bore drain-hose that passes through the motorhome's floor. When sufficient water has siphoned out for the vent to become exposed to the outside air through its drain-hose, there's a horrid spooky gurgling noise that put the wind up me when it first happened.

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