How do I use a 300 PSI air compressor to inflate my car tires?

Ah…. what I perceive is a simple question isn’t so simple if a person hasn’t ever done it, is it?

Here’s what you need to do.

First off, don’t worry about the fact that your compressor can generate 300 PSI. That’s a good thing.

On the discharge line from the tank to the coupler where you would connect an air line is a regulator. Not sure what this or does? Here’s complete info on air regulators.

All you have to do is “dial down” the pressure reading on this regulator (watch the gauge) to whatever pressure level you want your downstream application to see.

In your case, if you want to inflate tires without bothering to check the resulting tire pressure, set the regulator to the recommended pressure of your tire. That’s usually in the area of 35 PSI for light truck and car tires, but you need to look on your tire or on your car’s door post for the specs for your vehicle.

You connect your air line to the compressor discharge  coupler. Here’s info on those.


At the other end of the air line you need to have a tire filler tool (tire chuck) installed. The photo above is one of those.

One end fits onto the valve in your tire to allow air to flow in, and the other, with a  connector installed,  connects to the coupler on the end of your air hose.

Once you’ve got it all installed and connected, push the tire chuck onto the fill valve of your tire and the air will flow from your compressor into the tire and fill it to the pressure on your regulator gauge setting.

Make sure you set the regulator to the right pressure, or add air to the tire and then use a tire pressure gauge to check the tire. Make sure you don’t overfill the tires.

Good luck.

7 Responses to How do I use a 300 PSI air compressor to inflate my car tires?

  1. Justin says:

    Very carefully!

    For sure and for certain!!


  2. Ivan Schultz says:

    I tried, but can’t hear air going into tire. Should I be able to hear it?
    Furthermore, the pressure in the low tire remains the same. What am I doing wrong? I set the pressure on the out-gauge to 35 psi and nothing happens.

    • Bill says:

      Ivan, the flow of air from the compressor tank to the tire fill gauge is fairly straightforward. You likely only have a regulator between the tank outlet and the discharge coupling, with the regulator in the middle. If you have set the regulator to 35 PSI, that’s what is supposed to be flowing downstream from the regulator, into the discharge coupling, and then, if you have a hose with a tire fill valve on it, into that hose, and the air flow is then stopped by the tire fill valve. When the tire fill valve is put on the tire valve, the stem inside the tire valve depresses the tongue inside the tire fill valve which is on the hose, and the air flows. Have a look at the tire fill valve on the end of the hose. Note the little metal button in the middle of it. Turn that away from you, and push on it with a nail, or small enough object, and you should hear and feel air blowing out. Does this happen?

  3. I have an air compressor, a mower with low tire pressure and 3 different inflation kits but I can’t find the magic combination of parts that will connect the compressor to the tires. Can you help? None of the pieces that want to screw onto the tire, also want to fit into the end of the air compressor hose.

  4. Gene says:

    Hi Bill, what would cause very slow inflation? My compressor builds air just fin,(30gal tank @ 150psi) rated for 6.8 scfm @ 40psi.
    Air flows out the tire inflator valve perfectly. even jacking the output pressure up does not help.


    • Bill says:

      Gene… what is the pressure in the tank? What size is the compressor tank? What is the pressure setting on your regulator?

      If, for example, your tank pressure is 120 PSI, and your regulator is set for 50 PSI, are you saying that putting the tire chuck on the tire valve with these settings, air flows slowly into the tire?

      You connected your tire chuck to the air hose using a connector I expect? Is it the right connector for the coupler… and the same for where the air hose connects to the discharge coupler on the compressor?

      See under regulators for a related page.


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