Turn the shutoff valve on the gas line clockwise to turn the gas off, and remove the hose on the manometer. Place the cap on the regulator, replace the screw and tighten it to secure the cap. Turn the shutoff valve on the gas line counterclockwise to turn on the gas.Click to see full answer. Subsequently, one may also ask, how do I know if my gas regulator is bad?Signs of possible problems with a propane gas regulator or appliance include lazy yellow or orange flames; a popping noise when turning a gas burner off or on; flames floating above burner ports; roaring noises from burners; flames at the burner air intake; flames spilling out of the burner; and heavy deposits of soot how often should gas regulators be replaced? every 10 years Besides, how do you check a gas pressure regulator? Install a water column manometer or a suitable low-pressure gauge or measuring device in the second-stage regulator outlet test tap or in a test tap in the appliance gas shutoff valve at the gas appliance that is most-distant from the gas regulator being tested.What happens when gas regulator fails?In general, regulator failure would result in either too much or too little pressure downstream. If the regulator fails and allows too much gas to flow (a “failed-open” condition for the regulator), downstream pressure will increase. The relief valve will remain closed until pressure reaches its set point.