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How to Prevent and Fix Flashbacks on a Gas Grill

There’s nothing quite like cooking over a flame and enjoying the delicious characteristics fire can impart to our food. But flashbacks on a gas grill can be a startling and dangerous occurrence.

So, it’s always important to remember: that using a gas grill means working with a combination of gas and fire that can occasionally have disastrous consequences.

Unexpected flare-ups, flashbacks, and grease fires not only ruin your meal but can also risk your safety and that of those around you.

With a few precautions, you can gain a better understanding of these fires, how to avoid them, and what to do if they occur.

In this guide, we’ll share just that, diving into the causes of flashbacks and grease fires, what you can do to prevent them, and what steps to take if you do end up with a fire in your grill.

By understanding these dangers and adopting safe grilling practices, you can ensure your barbecues are both delicious and safe!

Key Takeaways

  • Regular Cleaning Prevents Fires: Regularly cleaning your grill’s venturi tubes, burners, and gas jets helps prevent flashbacks and grease fires by ensuring proper gas flow.

  • Know the Signs and Causes: Understanding the causes of flashbacks and grease fires, such as blockages and grease buildup, allows you to take proactive steps to avoid them.

  • Be Prepared for Emergencies: Always have a fire extinguisher, heat-resistant gloves, and either sand, baking soda, or kosher salt nearby when grilling to quickly and safely handle any fires. For more detailed guidelines on grilling safety, visit the NFPA Grilling Safety Tips.

What Is a Flashback on a Gas Grill?

A flashback on a gas grill occurs when flames unexpectedly shoot up toward the front of the grill when you light it.

When gas flow is obstructed, it can travel back up and out of the air shutter near the grill’s control knobs. If this gas ignites, it results in a flashback fire. These fires are sudden and can be dangerous.

What Causes Flashback Fires?

Flashback fires are caused by blockages in the venturi tubes, gas gets, or the interior of the burner.

These blockages can obstruct the proper flow of gas, causing it to travel back up and out of the air shutter located near your grill’s control knobs. If the gas that accumulates in this area ignites, it results in a flashback fire.

Most Common Blockage Causing a Flash Fire

The most common cause of blockages that lead to flash fires on a gas grill is the presence of small insects or spiders.

These creatures often build nests inside the grill’s venturi tubes, obstructing the flow of gas into the burner.

When gas flow is hindered, it can back up and ignite, resulting in a flash fire. Regularly inspecting and cleaning the venturi tubes can help prevent these blockages.

How to Clean Venturi Tubes to Prevent Flashbacks

You can prevent flashback fires by regularly cleaning your venturi tubes.

  • Remove the burner and venturi assembly using the clips under your grill.
  • Clean the inside of the tubes using a pipe cleaner, a long piece of flexible wire, a bottle brush, or a specialized venturi brush.
  • Shake the burner gently to remove any loose debris through the gas inlet. Alternatively, use a quick burst of gas pressure by turning the valve on and off.
  • Remove the hex head orifice and clean the hole and the inner part of the valve with a toothpick.
  • Clean the burner port holes with a toothpick or a paper clip to ensure they’re not blocked.
  • Check the gas jets for cleanliness.
  • Reassemble the burner and venturi assembly, reinstalling the clips under the grill to hold everything in place.

Regular maintenance helps make sure gas flows freely and reduces the risk of flashback fires.

What To Do if You’ve Experienced a Flashback Fire

If you’ve experienced a flashback fire when starting up your grill:

  • Turn off your grill and the gas supply.
  • Perform a leak test at all of the grill’s connection points using a mixture of water and dish soap — after you’ve sprayed or brushed the mixture on, if you have a leak, you should see small bubbles start to form.
  • Next, remove your grill’s control panel to inspect the manifold for any damages or leaks. Again, this is where that 50/50 soap and water mixture will come in handy!
  • Finally, remove the burners to check for any blockages. If you see any critters that have made a home inside the burners, follow the steps above to evict them and clean out the blockage.

After completing these steps, make sure everything is completely dried before reassembling your grill.

What’s the Difference Between a Flashback and a Grease Fire?

The primary difference between a flashback and a grease fire lies in their location and cause.

  • Flashback: A flashback typically occurs outside the burner box, at the front of the grill, when gas ignites due to blockages in the venturi tubes or gas jets. This causes flames to shoot up toward the front of the grill near the control knobs.
  • Grease Fire: A grease fire occurs inside the burner box, and is caused by the buildup of grease on the grill’s heat plates, cooking grates, or grease management system. Grease fires produce high flames, overwhelming smoke, and black soot, often damaging the grill’s interior and temperature gauge.

Understanding these differences helps in taking the appropriate preventive measures and responses.

Characteristics of a Grease Fire

Grease fires have distinct characteristics that make them identifiable:

  • High Flames: Grease fires produce very high flames that can quickly get out of control.
  • Overwhelming Smoke: They generate a large amount of thick, heavy smoke, which can be overwhelming and difficult to manage.
  • Black Soot: The fire leaves behind black soot, which can coat the inside of the grill and cooking grates.
  • Charring and Discoloration: The intense heat can cause charring or brownish discoloration on the inside of the grill’s lid and side panels.
  • Soot and Ash Build-up: You’ll notice a significant build-up of soot and ash on the cooking grates.
  • Damaged Temperature Gauge: Due to the extreme heat, the grill’s temperature gauge may be damaged or become inaccurate.

Recognizing these characteristics can help you quickly identify a grease fire and take appropriate action.

What Causes a Grease Fire on a Gas Grill?

Grease fires on a gas grill are typically caused by the following factors:

  • Buildup of Grease: Accumulated grease on the grill’s heat plates, cooking grates, or grease management system can ignite.
  • High Cooking Temperatures: Cooking at excessively high temperatures increases the risk of grease catching fire.
  • Cooking with the Lid Open: Grilling with the lid open while using high heat can cause grease to splatter and ignite.
  • Excessively Fatty Meats: Fatty meats drip grease onto the burners, which can catch fire.
  • Dripping Marinades: Marinades that drip off the food can contribute to grease buildup and fire.

Regular cleaning and proper grilling techniques can help prevent grease fires. We’ll discuss this more, below.

How to Avoid Grease Fires on a Gas Grill

The best way you can avoid grease fires on your gas grill is by getting into the habit of regularly cleaning your grill so that the buildup of grease can’t happen in the first place.

To avoid grease fires:

  • Regular Cleaning: Clean your grill regularly to prevent grease buildup on heat plates, cooking grates, and in the grease management system.
  • Cook with the Lid Down: Always cook with the lid down to minimize grease splatter and maintain controlled cooking conditions.
  • Oil the Food, Not the Grates: Apply oil to the food instead of the grill grates to reduce the amount of grease that can drip and cause fires.
  • Trim Excess Fat: Trim excess fat from meats before grilling to minimize grease drippings.
  • Use Lower Heat: Cook at lower temperatures to prevent grease from reaching its ignition point.
  • Manage Marinades: Avoid excessive marinades that can drip and cause grease accumulation.

By following these steps, you can significantly reduce the risk of grease fires.

How to Stop a Gas Grill Fire

Before using your grill, ensure you have a fire extinguisher, gloves, sand, baking soda, or kosher salt on hand.

If you do have a fire:

  • Shut off the grill knobs if you can.
  • Remove the food from your grill.
  • Use sand, baking soda, salt, or a fire extinguisher to smother the flames.
  • If safe, close the grill’s lid to cut off the fire from oxygen.
  • If you’re using a grill that has a propane tank and the fire starts getting near the tank, leave the area immediately and call the fire department.

While you can use a fire extinguisher to stop the flames, a fire burning near or on a propane tank is an extremely dangerous situation that always requires emergency responders.

Note: Using a fire extinguisher can ruin your grill, so use it as a last resort if salt or baking soda isn’t working.

How to Put Out a Grease Fire on a Gas Grill

Got a grease fire on your hands? Whatever you do, DO NOT try to put it out with water. Water can actually make the fire worse, and spread the burning oil around.

Instead, use that baking soda, kosher salt, or sand that you keep near your grill (you are keeping one of these near your grill, right?) to smother the flames.

If none of those methods work, reach for a fire extinguisher.

Can You Use a Gas Grill After It Catches Fire?

Yes, you may be able to use your gas grill after a fire, but:

  • Wait for the grill to cool completely before checking for damage.
  • If your fire was small and there doesn’t appear to be any damage, give your grill a thorough cleaning and then get back to grilling. We suggest using water and dish soap to remove all of the soot and charred bits, allowing the grill to dry, then reseasoning the grates using high-heat oil and a cloth or paper towel.

If there’s damage, either replace the damaged parts, have a professional inspect it, or consider buying a new grill.

Flashbacks on a Gas Grill – FAQs

To help you stay safe and informed while grilling, we’ve compiled answers to some frequently asked questions about flashbacks on gas grills. Understanding these common concerns can help you prevent and manage potential issues.

How Can I Safely Relight a Gas Grill After a Flashback?

You can safely relight a gas grill after a flashback by first ensuring the gas has dissipated, inspecting for blockages, and then following the manufacturer’s instructions for relighting.

What Safety Equipment Should I Have Nearby When Grilling?

You should have a fire extinguisher, heat-resistant gloves, and either sand, baking soda, or kosher salt nearby when grilling to handle any potential fires.

Can a Gas Grill Be Used Indoors or in an Enclosed Space?

No, a gas grill should never be used indoors or in an enclosed space because it produces carbon monoxide and poses a significant fire hazard.

How Often Should I Clean My Gas Grill to Prevent Fires?

You should do a basic cleaning of your gas grill after every use to remove grease and food particles and perform a thorough cleaning of all components at least once a month if you grill often.

Can I Use a Homemade Solution for Leak Tests on My Grill?

Yes, you can use a homemade solution of water and dish soap for leak tests on your grill. Apply the mixture to connection points and look for bubbles.

Flashbacks on a Gas Grill: Final Thoughts

Understanding why flashbacks and grease fires happen, how to prevent them, and how to put them out is crucial for safe and enjoyable outdoor cooking.

Regularly cleaning your grill and maintaining the burners can significantly reduce your risk of these dangerous situations.

With these safety tips, you can enjoy the delicious results of grilling without the worry of a flashback ruining your time!

Remember, consistent maintenance and vigilance are key to preventing fires and ensuring your grilling sessions remain both safe and enjoyable. Happy grilling!



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DisclosureAt The Grilling Life, I am committed to researching and writing thoughtful, informative and editorially independent reviews of the best products for your outdoor cooking needs.  If you like what I do, you can support me through my chosen links, which earn me a commission.  This allows me to continue sharing with you my love for all things barbecue.  Your support is truly appreciated.

Emily Lord

I’m a Wisconsin-based freelance writer and home cook who loves hosting parties and expressing my love for my family and friends through homemade meals and baked goods.

I blame Iron Chef and Chopped for my competitiveness in the kitchen.

In my free time, I occasionally run marathons as an excuse to eat more good food.