[header] How to fill an air tank [title] Take your air tank to an air compressor. [step] Full-service gas stations or truck stops are the most common locations that have air compressors. You can use the same pump motorists use to inflate the tires on their vehicles. 
[substeps] Inspect your air tank for damage before filling it, and get a new one if you see any cracks or rust. You may also be able to get your tank filled at scuba shops, paintball locations, and some sporting goods stores.