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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...

The tank holds air fine until you fill it, or it hisses from the fill port while you're gearing up. An r/airsoft player posted "HK Tank Fill Nipple Leaking?" with that problem. Short answer: an HPA fill nipple leak is usually a worn poppet o-ring or a thread seal, and both are cheap fixes. Why is my HPA fill nipple leaking? The fill nipple is a quick-disconnect male fitting with a small poppet inside that lets air in and keeps it there. ZDSPB's tank tech page calls these low maintenance parts that may need an occasional o-ring swap when they...