Pressure tests are conducted by licensed experts to ensure the right amount of gas is getting into your home and to your fixtures. If the pressure is too high, you may have too much gas pumping into the fixture and create a serious risk: Disconnect gas lines, install a test gauge close to your meter, turn off all valves the appliance uses, Keep main gas valve on (if you have one), pressurize the gas system using the valve on the test gauge, This then shows the pressure in the gas system. It should be no higher than one and a half (1 ½) times the working pressure, and no less than 3psi. Outside of that range and it’s no good.