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Fix a gas grill that has low flame

We'll rule out gas smell first, then help you fix a gas grill that has low flame—propane, regulator, burner ports, orifice, venturi—or tell you when to call a pro.

Troubleshooting · Home appliances
10–30 min
What you'll need
  • Needle or pipe cleaner (for clearing burner ports and orifice)
  • Compressed air (optional, for clearing orifice and venturi)
Step 1 of 9

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Quick triage — pick your path

Choose the option that matches what you see. You can jump straight to that section.

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Steps

Goal: Rule out gas smell, then fix a gas grill that has low flame.

  • Step back and sniff. If you smell gas, evacuate and call 911 or your gas utility from outside. Do not troubleshoot.
  • Confirm the grill lights but the flame is weak, yellow, or uneven. Proceed to Propane, valve, and regulator.
  • Good: You have ruled out fuel and gas flow. Proceed to Burner, orifice, and venturi path.
  • Bad: Gas smell—evacuate. Low tank or closed valve—fix and retest.

Gas smell check

Goal: Confirm there is no gas leak before troubleshooting.

  • Step back from the grill and sniff. Gas has a rotten egg odor.
  • Good: No gas smell. Proceed to Propane, valve, and regulator.
  • Bad: You smell gas. Evacuate everyone. Do not turn anything on or off. Call 911 or your gas utility from outside.

Propane, valve, and regulator

Goal: Rule out fuel and gas flow issues.

  • Check propane level—gauge or tank weight. A 20-lb tank when empty weighs roughly 18 lb. Replace or refill if low.
  • Confirm the gas valve is fully open (turn counterclockwise until it stops). Wait a minute for gas to reach the burners.
  • If the grill has not been used in a while, reset the regulator: turn off gas, disconnect hose from tank, wait 30 seconds, reconnect, open valve slowly.
  • Good: Tank has fuel, valve is open, regulator is working. Proceed to Burner, orifice, and venturi path.
  • Bad: Low tank or valve closed—fix and retest. Regulator faulty—replace or call a pro.

Burner, orifice, and venturi path

Goal: Clear blockages and adjust the air shutter for a strong blue flame.

  • Turn off the gas. Remove the grates and heat plates. Inspect burner ports for spider webs or grease. Clear each port with a needle or pipe cleaner—do not enlarge the holes.
  • Check the orifice for clogs. Disconnect the supply, use a needle or compressed air to clear—do not enlarge. Reconnect.
  • Inspect the venturi (tube where the burner connects to the valve) for spider webs or debris. Clear with a pipe cleaner or compressed air.
  • Adjust the air shutter—the plate near the burner inlet. Open slightly if the flame is yellow and sooty; close slightly if the flame lifts off. Aim for a steady blue flame.
  • Good: Flame is strong and blue. The grill works.
  • Bad: All checks done and flame still weak—call a pro.

When to get help

If you smell gas, evacuate immediately. Do not turn on lights or appliances. Call 911 or your gas utility from outside. Do not troubleshoot an active gas leak.

Call a pro if:

  • You have checked propane, valve, regulator, burner, orifice, and venturi and the flame is still weak.
  • You are not comfortable working with gas.

Never work on gas valves or gas lines yourself.

Verification

  • Flame is strong and blue when you turn the burners to high. Yellow tips are normal; mostly yellow or weak flame is not.
  • All burners produce even flame when tested one at a time.
  • No gas smell. No hissing from connections.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Gas smell check If you smell gas, evacuate and call 911 or gas utility from outside.
  2. Propane, valve, regulator Check propane level, gas valve open, regulator not locked.
  3. Burner and orifice Clear burner ports and orifice of spiders, debris, or grease.
  4. Venturi and air shutter Clear venturi; adjust air shutter for blue flame.
  5. Call a pro Gas smell—evacuate, call 911. All checks done and flame still weak—call a pro.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Propane level (if propane grill)
  • Whether burner ports and orifice are clear
  • Whether venturi is clear and air shutter is adjusted
  • Steps already tried

Do you smell gas?

Before any troubleshooting, step back and sniff. Gas has a rotten egg odor. If you smell it, evacuate and call 911 or your gas utility from outside.

Step back and sniff. Good: No gas smell—proceed to check propane and valve. Bad: You smell gas—evacuate immediately. Do not turn anything on or off. Call 911 or your gas utility from outside. Do not troubleshoot.

Yes No

You can change your answer later.

Evacuate and call 911

Evacuate everyone from the area. Do not turn on lights or appliances. Call 911 or your gas utility from outside. Do not return until the leak is resolved.

Done

Is propane level sufficient and gas valve open?

Check the tank gauge or weigh the tank. Confirm the gas valve is fully open (counterclockwise).

Check propane level—gauge or tank weight. Open the gas valve fully (counterclockwise). If low, replace or refill. Good: tank has fuel and valve is open. Bad: low tank or valve closed—fix and retest.

Yes No

You can change your answer later.

Refill or replace propane, open valve, retest

Refill or replace the propane tank. Open the gas valve fully. Wait a minute for gas to reach the burners. Turn on the burners and check flame strength. If flame is strong, you are done. If still weak, proceed to check the regulator and burner.

Done

Does the regulator need resetting?

Regulators can lock after long periods of non-use. Disconnect, wait, reconnect, open valve slowly.

Turn off gas, disconnect hose from tank, wait 30 seconds, reconnect, open valve slowly. Good: flame is stronger. Bad: flame stays weak—regulator may be faulty; replace or call a pro.

Yes No

You can change your answer later.

Are burner ports and orifice clear?

Spiders and debris can block burner ports and orifice. Turn off gas, clear with needle or brush.

Turn off gas. Remove grates and heat plates. Inspect burner ports for webs or grease—clear with needle or pipe cleaner. Check the orifice—clear with needle or compressed air. Do not enlarge holes. Reconnect and test. Good: flame is stronger. Bad: still weak—check venturi.

Yes (clear) No (blocked)

You can change your answer later.

Clear burner and orifice, retest

Clear burner ports and orifice. Reconnect and test. If flame is strong, you are done. If still weak, check the venturi and air shutter.

Done

Is the venturi clear and air shutter adjusted?

Blocked venturi or misadjusted air shutter can weaken the flame.

Turn off gas. Inspect the venturi for spider webs or debris—clear with pipe cleaner or compressed air. Adjust the air shutter for a blue flame. Good: flame is strong and blue. Bad: still weak—call a pro.
Question

Is venturi clear and air shutter correct?

Done

Call a pro

If you smell gas, evacuate and call 911 or your gas utility from outside. Call a pro if: you have checked propane, valve, regulator, burner, orifice, and venturi and the flame is still weak; or you are not comfortable working with gas. Never work on gas valves or gas lines yourself.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a gas grill have low flame?
Common causes: low propane tank, gas valve not fully open, regulator locked or faulty, clogged burner ports or orifice, blocked venturi, or air shutter misadjusted. Check propane and valve first, then reset the regulator and clear blockages.
Can I fix a gas grill that has low flame myself?
Yes. You can check propane level, open the gas valve, reset the regulator, clear burner ports and orifice, and adjust the air shutter. Regulator or gas valve replacement may require a technician.
When should I call a pro for a gas grill that has low flame?
If you smell gas, evacuate and call 911 or your gas utility from outside. Call a pro if you have checked propane, valve, regulator, burner, orifice, and venturi and the flame is still weak, or if you are not comfortable working with gas.

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