When you find that you have a low or flat tire, you’ll be thankful you’ve packed a portable tire inflator in your vehicle. All Portable Tire Inflator Options Are ValidSince portable tire inflators are designed for situations when you discover an unexpected flat or low tire, all these options are valid depending on your needs and budget. How to Operate a Portable Tire InflatorConnect the portable tire inflator to the appropriate power source and turn it on. Set the desired tire pressure using the portable tire inflator’s controls and display. After the desired pressure is reached, turn off the portable tire inflator and remove the hose from the tire valve stem.