I have not tried it but I don't believe the POL valve will prevent liquid flow when the tank is turned upside down. The valve is operated by a float. In the normal tank position as the liquid propane level rises the buoyancy of the float closes the valve. If you turn the tank upside down the bouyancy of the float should open the valve - it wants to float up. In this position as the liquid level is lowered the float would likely close the valve preventing complete discharge of the propane. As another poster pointed out any restrictor can be a problem, liquid or vapor.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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