Gas Grill: Burners not getting gas
First, check the tank's propane level to make sure the tank has gas. Next, reset the pressure regulator to restore gas flow through the regulator if the regulator's flow-limiting device tripped. Replace the pressure regulator if it doesn't allow gas to flow to the manifold after resetting the flow-limiting device. Check the operation of the burner valves on the manifold and replace the manifold if gas doesn't flow properly to the burner tubes when you open the manifold's valves.
Gas won't flow through misaligned burner tubes, so check and adjust burner tube alignment with the gas valves. Clogs in the burner tubes can also inhibit gas flow through the tubes. Clean clogs such as spider webs and spills from the burner tubes to restore gas flow through the tubes.
Replace the gas grill pressure regulator
If the pressure regulator isn't working properly, first reset the pressure regulator, following the instructions in your owner's manual. To reset most pressure regulators, shut off the gas supply valve at the tank, disconnect the hose/regulator from the tank, wait 30 seconds and then reconnect the hose/regulator. Slowly open the gas supply valve on the tank. If the regulator still doesn't work properly, replace it.
Clean, repair or replace the gas grill burner
Regularly check and clean the burner tubes of spider webs and debris. Clean the burner tubes with a bottle brush or stiff wire, such as a straightened coat hanger. Check the gas ports (holes) for spills that could glog them. Clean the burner if necessary. Look for rust or damage on the burner bodies and replace a burner if it's damaged or rusted.
Replace the gas grill manifold
The manifold on a gas grill has the burner control valves and the connecting gas tubing. If the manifold fails, burners won't heat sufficiently or won't light at all. If a valve is stuck and not working, replace the valve. If the individual valve isn't available as a separate replacement part, replace the entire manifold.
Adjust and align gas grill components
Remove the grates and the flavor bars. Check the alignment of the burners. Make sure that all fasteners are in place. Check the igniter electrode. The tip of the igniter should be within 1/8- to 1/4-inch of the gas burner. Adjust the igniter if necessary.
You can install a new pressure regulator on your gas grill if the pressure regulator won’t let gas flow.
Replace a broken or damaged wheel in less than 15 minutes.
Clogged or corroded burners and flame tamers could be the problem.
This video helps troubleshoot issues with the pressure regulator, burner tubes, igniter electrodes and the spark module.