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Old 02-07-2023, 03:07 PM   #1
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Filling a propane tank - 2 hose model

The RV is a 2002 Nat'l Tradewinds with a 70 gallon porpane tank.

Recently I went to the local larger station with a propane fill area. I had purchased propane at this location before. The attendant started to fill the tank and the adaptor between the hose and the tank started leaking. I quickly said that is all I need and left.

Upon thinking back when I had purchased propane before not only had the overflow valve on the tank been opened, the return valve on the smaller return hose had been opened during filling. This allows excess pressure to vent back to an outlet near the tank.
Am I remembering correctly?

On the 'two' hose propane fill tanks the smaller return hose is opened during filling. This allows a small amount to be vented back to an outlet and releaves the excess pressure.

I speculate the leaking adaptor was operator error and not a malfunctioning valve.

Thanks in advance. Dan
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Old 02-07-2023, 04:09 PM   #2
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Leaking adaptor is bad or missing seal in your fill fitting. Look and see if it's there.

The two hose system is only to relieve pressure in the hose before you disconnect it.

Propane is pumped in liquid state, as the tank fills, the gas inside the tank turns to liquid and the pressure does not build.
The small bleeder valve is opened as a fill indicator. It is set at 80% capacity and will spit liquid propane when the tank is at 80% capacity, considered full.
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hose, propane, tank



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