I'm not sure what you are asking but let me tell you how we do it. We make sure the level is pointing to water tank. My wife who does it, keeps checking the light sensor until it shows full. When I do it, I fill it until I see some water coming out the overflow little hose. Not sure if this help.
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2017 Leprechaun 311 FS
Jeep Patriot and Cherokee as toad.
Enjoying retirement.
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