Fog Machine Spitting Liquid: Common Causes and Solutions

When a fog machine spits out liquid instead of producing fog, it is likely a result of defective or cracked seals. It is important to inspect the pump seals for any signs of fractures or corrosion. When the seals are not functioning properly, air can enter the system, causing the fog juice to spit out as liquid instead of vapor.

By identifying and fixing the faulty seals, the fog machine can be restored to its proper functioning state, providing a smooth and consistent fog output.

Fog Machine Spitting Liquid

Causes of Fog Machine Spitting Liquid

When a fog machine starts spitting liquid instead of producing fog, several factors could be at play. Understanding these causes can help troubleshoot the issue and prevent further problems.

1. Overfilled Fluid Tank

An overfilled fluid tank can lead to excess fluid leaking out, causing the machine to spit liquid. It’s essential to fill the tank only to the recommended level to avoid this issue.

2. Clogged Fluid Lines

Dirt or debris buildup in the fluid lines can obstruct the proper flow of fluid, resulting in spitting liquid. Regular cleaning of the fluid lines is crucial to prevent clogs and ensure uninterrupted fog production.

3. Dirty Heating Element

A dirty heating element can cause the fluid to boil unevenly, leading to spitting liquid. Regular cleaning of the heating element is necessary to maintain its efficiency and prevent disruptions in fog output.

4. Incorrect Fluid Type

Using the wrong type of fluid in the fog machine can cause it to spit liquid. It is vital to use the recommended fluid for your specific machine to ensure optimal performance and fog production.

5. Low Fluid Level

Insufficient fluid levels can hinder the fog machine’s ability to generate enough fog, resulting in spitting liquid. It is important to keep the fluid level at the recommended amount to avoid this problem.

6. Faulty Pump

A malfunctioning pump may fail to distribute the fluid adequately, leading to spitting liquid. If a faulty pump is suspected, it may need to be replaced to restore proper fog production.

By understanding these causes, users can address the issues that may trigger the spitting of liquid from fog machines, ensuring uninterrupted fog effects during performances or events.

How to Fix a Fog Machine That’s Spitting Liquid

If your fog machine is spitting liquid instead of producing fog, there are several steps you can take to address and fix the issue:

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1. Check the fluid level

Ensure that the fluid tank is not overfilled or underfilled. Follow the manufacturer’s recommendation for the correct fluid level. If the tank is overfilled, the excess fluid can leak out and cause the machine to spit liquid.

2. Clean the fluid lines

Regularly clean the fluid lines to remove any dirt or debris that may be causing a blockage. Clogged lines can prevent the fluid from flowing properly, leading to liquid spitting.

3. Clean the heating element

A dirty heating element can cause the fluid to boil and spit out of the machine. Clean the heating element regularly to ensure it is free of dirt and buildup.

4. Check the pump

If the machine still spits liquid after checking the fluid level and cleaning the lines and heating element, the pump may be faulty. Consider troubleshooting the pump or replacing it if necessary.

By performing these simple steps, you can troubleshoot and resolve the issue of a fog machine spitting liquid. Regular maintenance and following the manufacturer’s recommendations for proper fluid usage and machine care can help prevent this problem from occurring in the future.

How to Store Your Fog Machine

Properly storing your fog machine is essential to maintain its functionality and prolong its lifespan. Follow these steps to ensure that your fog machine is stored correctly:

1. Choose a suitable storage location

Keep your fog machine in a cool, dry area away from extreme hot or cold temperatures. Avoid storing it in places like attics or basements where the temperature can fluctuate significantly.

2. Fog the machine before long-term storage

If you plan to store the fog machine for more than eight months, it’s recommended to fog it a few times before storing it. This helps ensure that the pump and nozzle are not blocked and will function properly when you use the machine again.

3. Clean and dry the fog machine

Before storing the fog machine for an extended period, thoroughly clean it to remove any residual fogging solution. Empty any remaining solution from the tank, as it can cause damage to the container and pumping mechanism if left inside.

4. Wash and dry the container

After emptying the solution, wash the fog machine’s container carefully to remove any residue. Make sure the container is completely dry before storing it to prevent corrosion on the tank or other components.

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By following these steps, you can ensure that your fog machine is stored properly and ready for use whenever you need it.

Safety Tips For A Fog Machine

To ensure the safe and proper operation of your fog machine, it is important to follow these safety tips:

1. Unplug the main power source

Before connecting or disconnecting anything from your fog machine, always remember to unplug the main power source. This will prevent any electrical accidents or malfunctions.

2. Provide adequate ventilation

When using a fog machine, it is crucial to place it in a location that allows for proper ventilation. This will help dissipate the fog and prevent the build-up of potentially harmful chemicals in the air.

3. Secure power cords

To avoid any tripping hazards or damage to the power cord, make sure to route it carefully and keep it out of the way of people walking by. Secure loose cords to prevent accidental disconnection or entanglement.

4. Check voltage compatibility

Before using your fog machine, ensure that the voltage of the power outlet matches the requirements of the machine. Using incorrect voltage can cause damage to the fog machine or pose a safety risk.

5. Avoid removing the top cover

The top cover of your fog machine should never be removed, as it contains important components and safeguards. Removing the cover can result in electrical hazards or damage to the machine.

6. Turn off when not in use

When the fog machine is not in use for an extended period, it is recommended to turn off the main power. This helps conserve energy and reduces the risk of any accidental activation.

7. Avoid using dimmer packs

Using a dimmer pack with a fog machine is not recommended, as it can interfere with the machine’s intended operation and may damage the fog machine or pose a safety risk.

8. Water and liquids

Never spill water or any other liquids into or onto your fog machine. This can damage the internal components and may cause electrical shocks or fire hazards. Always keep the fog machine dry and away from moisture.

9. Check the fluid reservoir

Before operating the fog machine, ensure that the reservoir contains the appropriate amount of fog fluid. Using an empty or insufficiently filled reservoir can damage the fog machine and affect its performance.

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10. Protect from rain or moisture

To prevent electrical shocks or fire hazards, avoid exposing your fog machine to rain or moisture. Always operate the fog machine in dry conditions and store it in a safe, dry place.

By following these safety tips, you can enjoy the benefits of your fog machine while ensuring a safe and hazard-free environment.


Why is my fog machine spitting liquid?

There are several reasons why a fog machine might start spitting liquid. Some common causes include an overfilled fluid tank, clogged fluid lines, a dirty heating element, incorrect fluid type, low fluid level, and a faulty pump.

How do I clean my fog machine?

To clean your fog machine, you’ll need a cleaning solution specifically designed for fog machines. Follow the instructions on the solution and make sure to clean the fluid lines, heating element, and pump.

Can I use any type of fluid in my fog machine?

No, you should only use the recommended fluid for your specific fog machine. Using the wrong type of fluid can cause the machine to malfunction and potentially damage it.

How often should I clean my fog machine?

It’s recommended to clean your fog machine after every 20 hours of use or at least once a year if you don’t use it often.

How do I know if my fog machine pump is faulty?

If your fog machine is spitting liquid and you’ve checked the other potential causes, it’s possible that the pump is faulty. You may need to replace the pump to fix the issue.

Can I fix my fog machine pump myself?

It’s possible to replace the pump yourself, but it’s recommended to have a professional do it to avoid potential damage to the machine.


If your fog machine is spitting liquid instead of producing a thick, atmospheric fog, it’s time to troubleshoot and find a solution. Whether it’s a clogged nozzle, incorrect fluid, or a malfunctioning machine, don’t let a little hiccup dampen your party or event.

With a bit of patience and some simple fixes, you’ll have your fog machine back in top shape, creating an unforgettable ambiance for all your future gatherings. So, don’t let the fog machine woes get you down, keep the party going and let the fog roll in!