I have a Craftsman Air compressor 919.150380. My tire needs air. My husband passed away 3 yrs. ago, and I don't know how to operate it. Can't find owner's manual or one online.

Pneumatic tools are rated in cfm (cubic feet per minute). Your 1 HP air compressor is rated at probably not more than 3 cfm while the 1/2 " impact driver needs at least 8 cfm, maybe 12 chm of air.
The compressor must provide more chm than tool rating needs.
It is a problem, by the time you look at five horse power air compressors and larger, a lot of electric power is needed. A circuit of 220 volts, 20, 30, or more amps would be required to run those large expensive compressors.
If you can, return the air tool and get a good electric tool instead.
Leave those high air volume air tools to shops that are so equipped to use, or invest if you must.

you can get quick connect adapters at home depot, lowes or most auto parts houses

go google searspartsdirect. enter model number, free diagrams!!

The two most important specs are CFM at 90 psi (that's how fast the compressor can compress more air when the tank starts to run low) and how big the tank is. Virtually any compressor that has a top pressure rating 20 psi higher than you need for your tool (which is usually about 90 psi) and that has a tank of a couple of gallons will work. But the smaller the tank, the shorter time you can operate the tool before the compressor has to kick in. And the lower the CFM at 90, the longer you will have to wait for the tank to come up to pressure again so you can operate the tool at full pressure. If this is for occasional use and you aren't in a hurry, you don't need much of a compressor at all. If you want to operate continuously, then you should get something with a CFM at 90 psi that is higher than your tool's CFM consumption. Keep in mind that impact wrenches don't operate continuously like paint sprayers do. Good luck. Vote if you found this helpful. Al K

It is possible that the compressor psi as it is running drops below the tire psi creating a standoff. You must maintain air compressor psi over 110 to fill a tire to 110psi. Add air to your tire but stop when the compressor motor starts to run. When the motor stops then continue to add air until the compressor motor starts and again stop airing up the tire. Repeat as needed.

The compressor in question is basically a throw away.
My personal opinion is it's more trouble then it's worth.
Even after it's fixed you still have a throw away compressor.
However it is possible to repair it if the parts are still available.
Check out the link below for parts and diagrams for the compressor in question.

Hope this helps and good luck.

http://www.mastertoolrepair.com/-c-271_535_537.html
http://www.mastertoolrepair.com/

sounds like you have a bad batch of schrader vales on your tires OR

you have a defective chuck end that is not milled properly to push the schrader valve and let the air into the tire stem

This sounds like a pressure switch failure. follow the power cord to where it enters the compressor and the switch should be there. you should be able to order a new one through sears service center. Good luck.

Yes , the check valve will cause this. The check valve has a flat disk with a spring that holds it down that the air passing past it erodes away till it leaks then the air that the piston pushes into the tank does not stay in the tank but returns right back into the cylinder and puts a load on the piston. Also makes the compressor hard to start back up if it does get pumped up. Some have a dump valve that drains the pressure off the head after they shut off so it can start with no load. So if there is air bleading back and leaking at the pressure swith that will be a for sure sign it is the check valve.

put a blower on the hose and see if air comes out
very possible there is a blockage in the hose or if you are using quick connects they may have failed