You'll go crazy thinking one tank is empty, and why won't it switch, and will it ever switch! Like a can of shaving cream, there is always a little bit more. Don't bother loosening, or shaking, or watching liquid levels. As long as the indicator is still green or black (depending on model, but not red), then it is drawing off the tank it is pointing towards. When the switchover occurs, as described, the red flag becomes very obvious in the window. Now flip the lever towards the new supply tank (i.e. the other one) and the red flag goes away. Now you can turn off and replace the first tank, just like they said.
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Marty and Martha
2015 Z-1 211RD
2012 Nissan Titan
Dalzell SC
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