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When I suck antifreeze into the winterizing port of our 10 year old Montanna I have my wife hold the jug of antifreeze and keep the hose at the bottom of the jug. When the jug gets close to empty I shut off the pump and go out and switch jugs. Then I go back in and turn on the pump again. Pump will just spin and will not stop like when it gets to full pressure. If I open a faucet, it immediately starts to draw antifreeze from the new jug and when I shut off the faucet, the pump builds pressure and then stops.
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