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Venturi Tubes: The venturi tubes connect the control valve to the burner(s) and mix the fuel with air to provide flame. To mix the air into the fuel there is an open gap in the fuel line here that can easily become obstructed. Insects, especially spiders, love this space and given half a chance will move in as quickly as possible. The best solution for this is to wrap the venturi tubes with an aluminum screen that will not block the airflow but will keep the critters out. Another common problem here is a misalignment of the venturi tubes with the burner. Typically the venturi tubes are simply placed in the fuel line and can get knocked out of place. The venturi tubes typically have adjustable shutters. You may need to adjust these to regulate fuel flow.

Burners: Burners come in many shapes, sizes and materials particular to your specific grill. What the burner is made of will tell you pretty much how long it will last. Burners range from aluminized steel at the low-end to cast brass on the high end. Low end burners will typically last about 3 years under normal circumstances. Because the burner is inside the grill it tends to get coated in burnt grease and can corrode quickly. Inspect and clean your burner regularly to avoid problems. If the burner is damaged to heavily corroded you will need to replace it. Get the same size and shape of burner but consider purchasing one of a better quality metal if yours isn’t top of the line.

Barrier: In between the burner and the cooking grate is something. I call it a barrier; some people call it a radiant. It is called a radiant because it is supposed to absorb and release heat evenly to the cooking surface. However I don’t find it to be very good at this. The way I see it the barrier protects the burners from drippings and creates a place for grease to collect and burn off. Either way what I’m talking about is lava rocks, ceramic briquettes or metal plates. These need to be replaced periodically as they become crusted in burnt grease and food and can create an unpleasant flavor on foods as they age. Lava rocks, because they are porous tend to need replacement more often. Metal plates can typically be cleaned and used for a longer time. Inspect your barrier. If it is broken up, heavily coated or simply not creating a sufficient barrier, consider replacing it.