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Are you are inverting the tank during filling right? Sorry to ask such a basic question but it's always good to assume that the simplest mistake is being made. People when first starting out with gas guns will neglect to invert the tank and will only fill the gun with a small amount of gas.
Also, to tell if your tank is full or empty is usually a matter of weight and "movement" when gently rocking the tank it should feel like it's full of lightweight sand or semi fluid, it's hard to explain. A good indicator is also weight, as tanks are measured by weight it's always a good idea (if you have the option) to weight your tank when first purchased and record the weight. That way you can then use that starting weight and once you have subtracted roughtly the indicated weight of the fluid (usually 1 or 2 pounds for common tanks) then you know you are empty and can dispose of the tank.
Hope this helps.
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