If your grill won’t stay lit, the most likely culprits are a clogged burner tube, a faulty regulator, or low propane pressure. Start by checking the gas supply: if using a propane tank, make sure it’s at least 20% full (weigh it or use a tank gauge). For natural gas grills, ensure the shutoff valve is fully open. Then inspect the burner tubes for blockages from grease or debris; clean them with a wire brush or pipe cleaner. If the flame still goes out, the regulator may be stuck in safety mode or defective.

Quick Answer

Q: Why does my grill light but then go out? A: Likely a clogged burner (spider webs or grease), low propane, or a tripped regulator. Q: How do I reset my grill regulator? A: Disconnect the tank, open all burner valves for 2 minutes, close valves, reconnect tank, and light slowly. Q: Can a faulty igniter cause the flame to go out? A: No – igniter only sparks to light; flame-out is a gas flow issue.

  • Clogged Burner: Spider webs, grease, or rust can block gas flow. Clean burner tubes with a wire brush or compressed air.
  • Regulator Safety Lock: If you open the tank valve too fast, the regulator restricts gas flow. Reset by closing tank, disconnecting, venting, and reconnecting.
  • Low Propane: Below 20% tank capacity reduces pressure. Weigh tank or use a gauge; refill if under 4 lbs.
  • Faulty Regulator: A defective internal diaphragm can’t maintain pressure. Replace if reset doesn’t work.
  • Thermocouple Issue: On some grills, a faulty thermocouple shuts off gas if it doesn’t detect heat. Clean or replace it.

Check the Gas Supply

First, confirm you have enough fuel. For propane grills, a full tank weighs about 20 lbs (37 lbs total with tank); if it’s under 4 lbs of propane, refill. For natural gas, ensure the shutoff valve is fully open (parallel to the gas line). Low pressure is the most common reason for a grill that lights but won’t stay lit.

Also inspect the gas hose for kinks or damage. A pinched hose restricts flow. Straighten any kinks and replace the hose if cracked or brittle.

Clean the Burner Tubes

Remove the cooking grates and heat deflectors to access the burners. Look inside the burner tubes (the open end where gas enters) for spider webs, dirt, or grease. Use a pipe cleaner or a thin wire brush to scrub the inside. Also clean the burner ports (small holes along the top) with a stiff wire brush or a toothpick.

After cleaning, check for rust or corrosion. If the burner has large holes or is flaking, replace it. Reinstall everything and test the flame – it should be blue and steady, not yellow or flickering.

Reset the Regulator

If you opened the propane tank valve too quickly, the regulator may have entered safety mode, limiting gas flow. To reset: close the tank valve, disconnect the regulator from the tank, open all burner valves (including side burner if any) for 2 minutes to release pressure, then close them. Reconnect the regulator, open the tank valve slowly (only one-quarter to half turn initially), then light the grill.

If the flame stays lit, slowly open the tank valve fully. If the flame dies again, the regulator may be defective and need replacement. This is common on grills three years or older.

Inspect the Thermocouple (If Equipped)

Some gas grills have a thermocouple safety device that shuts off gas if the burner flame goes out. If it’s dirty or faulty, it can cut off gas prematurely. Locate the thermocouple – a small metal rod near the burner – and clean it with fine sandpaper or a scouring pad. Ensure it’s positioned correctly so the flame directly contacts its tip.

If cleaning doesn’t help, test by holding down the igniter button for 10 seconds after lighting. If the flame stays lit only while holding the button, the thermocouple is likely bad and needs replacement.

Check for Airflow and Ventilation

Insufficient oxygen can cause the flame to sputter and die. Make sure the grill’s air shutters (adjustable plates near the burner) are open enough. A closed shutter starves the burner of oxygen. Adjust until you get a blue flame with minimal yellow tips.

Also ensure the grill lid is open when lighting, and that there’s no wind blowing directly into the burner area. If windy, use a grill wind guard or reposition the grill.

Pro Tips

  • Clean burner tubes at the start of each grilling season. Spider webs are a top cause of flame-outs.
  • Always open the propane tank valve slowly to prevent regulator lockout.
  • Use a tank gauge (dial or digital) to monitor propane level – don’t rely on lifting the tank.
  • Replace the regulator every 5 years as a preventive measure, even if it seems fine.

Common Mistakes to Avoid

  • Cranking the propane tank valve open all the way immediately – this triggers the regulator safety lock.
  • Ignoring a yellow or lazy flame – it indicates a clogged burner or air issue that will worsen.
  • Using a grill with a damaged gas hose – it’s a fire hazard and causes pressure loss.
  • Assuming the igniter is the problem when the flame goes out – the igniter only sparks; focus on gas flow.

FAQ

Why does my grill flame go out on high but stays lit on low?

This often indicates a gas supply issue – either low propane pressure or a regulator that can’t handle high demand. Check tank level and reset the regulator. If the problem persists, the regulator may need replacement.

Can a dirty burner cause the flame to go out after a few minutes?

Yes. Grease and debris inside the burner tube can block gas flow, causing the flame to weaken and die. Cleaning the burner tubes thoroughly usually fixes this.

How do I know if my regulator is bad without replacing it?

If after resetting the regulator (disconnect, vent, reconnect) the grill still won’t stay lit, and you have verified propane level and clean burners, the regulator is likely defective. A faulty regulator may also cause weak flame or fluctuating heat.

The Bottom Line

A grill that won’t stay lit is usually a simple fix: check fuel, clean burners, reset regulator, or replace a faulty part. By methodically troubleshooting these areas, you’ll be back to grilling in no time. For persistent issues, consult your grill’s manual or a professional technician.

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