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The field filled you to 3,000, and twenty minutes later the gauge reads a few hundred less. An r/paintball player asked why their 48/3000 tank "loses pressure right after airing up." Short answer: an HPA tank hot fill heats the air, and the reading drops as it cools. Usually nothing is broken. Why does an HPA tank hot fill read low later? Fast fills heat the air and the bottle. Hot air pushes harder, so the gauge reads high at the station, then settles as the tank cools. The New Jersey Scuba air fills page says the proper way to...

Your pistol still cycles, but the needle is hugging the bottom of the dial. An r/airsoft player asked "When HPA tank is completely empty?" and the honest answer is that your HPA tank gauge and your gun will tell you different things. The gun usually quits being useful well before the needle hits zero. How do you read an HPA tank gauge near empty? The tank gauge shows bottle pressure, not what reaches the gun. Player report: replies in that thread said the tank is empty when the gauge sits at zero and no air comes out when you connect...