>>1099063> Long shelf lifePropane will literally last forever, the tank will rust away before the propane goes bad.
>They often vent the engine heat towards the tank to keep it up to pressure.The only time a propane tank will vent gas, is if it's filled to max capacity in the winter and then subjected to high heat in the summer (while still at max capacity) and even then, only a little bit will vent.
