It is my understanding that all propane bottles used on the TM have already been weighed empty. You should find that weight stamped on the upper collar of each bottle. Then weigh your tanks when full. Write this "filled weight" down on the side of your tank using a magic marker. The difference between the bottle weight and the full weight will tell you the number of pounds your specific tank holds. Then when in doubt about the quantity of the unused propane, weigh the tank again. Note the difference in pounds of propane that was used. You should be able to determine the percent of remaining propane. Or if someone here knows the weight of a gallon of propane, you can also determine the number and percent of gallons remaining.
Hal
There is another factor (or urban legend?) to be considered. Each time a bottle is refilled, an unknown amount of moisture (water?) is pumped into the bottle. Being that water does not ignite, it remains in the bottle and is added to by more water each time it is refilled. Eventually you will have too much water by weight and bottle capacity. Thus each time you refill your bottle you will get less and less of a full capacity of propane. Whether this is a fact or not, something similar to this did happen to me. Just before a camp out, I had my bottles filled. The first bottle that I began to use had only a red flame and very little blue. It was as though it was empty of propane. I turned the control valve over to the other bottle and all worked well. I took the unusable bottle to another propane dealer and he told me that the bottles should be throughly bled, not just a few minutes of bleeding. It took him about a half hour to bleed mine thoroughly From then on it worked like new. Since then when I have my bottles filled, I request that they need to be bled thoroughly. I get different responses such as they really do not need to be bled to this extent. Of course the person fills the tank has to stand by the process during the whole time and wants to do some other things besides stand for a half hour. If this is all true, those distributors of propane that charge one price for a fill-up or a top off, always come out ahead because if you are filling your tanks you will also be paying for the water that is already inside them.
Supposedly, here in Denver at least, all of the U-Haul stores charge you by the amount they place in the bottle. Could this be a nationwide policy?
Hal
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