Preventing grease flare-ups in your KitchenAid gas grill
Grease flare-ups are often caused by damaged or dirty flame tamers so clean or replace the flame tamers when grease flares up while you're grilling.
Grease can also pool on corrosion inside the firebox instead of sliding down into the grease cup. Replace the firebox if you find corrosion that's collecting grease. Another source of flare-ups is too much grease and debris in the grease pan below the burners. Old, dried grease left in the drain pan will liquefy, vaporize and then burn as the grill heats up. Check the grease pan before firing up your grill and clean the pan if you find heavy residue.
How to fix your KitchenAid gas grill when burners aren't 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.