you probably have to 2-30 pound tanks which is 14 gallons total and you probably were due to run out of propane. With your system you probably have an automatic switch to a full tank once you run out of propane in one. If your switch is pointing toward one of your tanks and their is a little 'red' flag, you have run out of propane in that tank and you are drawing from the other tank. Time to flip your switch toward the other tank and a 'green' flag should come up. Time to get the empty tank filled and you will never run out
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