Are you having trouble starting your lawn mower because there is water in the gas tank? Don’t worry; this is a common problem that can be easily fixed.

A lawn mower’s gas tank is crucial for maintaining your lawn’s appearance and health. However, water can inadvertently mix with gasoline, especially during rainy seasons or if the mower has been stored improperly. This contamination can lead to poor engine performance, starting issues, and even severe damage to the mower.
In this guide, we will explore effective methods of how to get water out of lawn mower gas tank, ensuring that your equipment runs smoothly and efficiently. By understanding the signs of water contamination and following the proper steps, you can keep your mower in optimal condition and ready for action.
What Will You Need?
Before we dive into the methods, here are some items you will need to remove water from your lawn mower’s gas tank successfully:
- A drainage container or a clean, empty gas can
- A funnel
- Clean rags or paper towels
- Gloves and safety glasses for protection
- Fresh gasoline
Once you have gathered these items, you can remove the water from your lawn mower’s gas tank.
10 Easy Steps on How to Get Water Out of Lawn Mower Gas Tank
Step 1: Ensure Safety First
Before you begin, make sure your lawn mower is turned off and cool to the touch. Remove any spark plug wire to prevent accidental starting. This step is crucial for your safety. Wear gloves and safety glasses throughout the process to protect yourself from gasoline fumes and spills.
Step 2: Drain the Gas Tank

Next, locate the drain plug, which is usually found at the bottom of the gas tank. Place your drainage container or clean gas can underneath the drain to catch the fuel as it exits. Carefully open the drain plug or use a siphon pump to remove the gasoline. Allow the fuel to drain fully, ensuring that any water mixed with the gas is also collected. If you’re using a siphon, create a proper vacuum for efficient draining. Once the tank is empty, you’ll be ready for the next step.
Step 3: Inspect the Gas Tank
After draining the tank, inspect its interior. Use a flashlight to look for any remaining water or debris that may have settled at the bottom. If you can see water, it’s essential to remove it entirely to avoid any further contamination. Also, check the condition of the gas tank itself for any signs of corrosion or damage. If the tank appears in good shape, proceed to the next step.
Step 4: Remove Residual Water
If you notice any residual water at the bottom of the gas tank, remove it to prevent future issues. One effective method is to use a clean rag or paper towel to soak up the water. Carefully insert the rag into the tank, allowing it to absorb the water. Ensure not to leave any lint behind, as this could lead to further complications. If necessary, repeat this process with fresh rags until no moisture remains. Ensure that the interior of the tank is thoroughly dry before moving on to the next step.
Step 5: Refill with Fresh Gasoline
Once you have ensured that the gas tank is completely dry and free from any residual water, it’s time to refill it with fresh gasoline. Using a funnel, carefully pour the new fuel into the tank, avoiding any spills.
Make sure to use high-quality gasoline suitable for your lawn mower, as this will enhance performance and reliability. Fill the tank to the recommended level, but be cautious not to overfill, as this could lead to spillage during operation. After refilling, securely close the gas tank cap to prevent contamination from outside sources.
Step 6: Reconnect the Spark Plug Wire
After refilling the gas tank with fresh gasoline, it’s time to reconnect the spark plug wire. Ensure the mower is still safe, with no chance of accidentally starting during this process. Firmly attach the spark plug wire back to the spark plug, ensuring a secure connection. This step is essential because it enables the mower to start correctly when you attempt to operate it. Once the spark plug wire is reattached, you can proceed to the next step.
Step 7: Start the Mower

With the gas tank refilled and the spark plug wire reconnected, it’s time to start your lawn mower. Ensure that the area around the mower is clear of any debris or obstacles. Turn the ignition key or pull the starter cord, depending on your mower’s design.
Allow the engine to run for a minute or so, letting the fresh gasoline circulate through the system. This will help to flush out any remaining contaminants. Keep an ear out for any unusual sounds that could indicate residual water or other issues. If the mower starts and runs smoothly, you’ve removed the water! If it struggles to start or runs rough, you may need to repeat some previous steps or consult a professional for further assistance.
Step 8: Monitor Performance
Once your lawn mower is running, monitoring its performance during operation is essential. Keep an eye out for any signs of unusual behavior, such as sputtering, stalling, or decreased power, which could indicate remaining water or other issues in the fuel system.
When operating the mower in a flat, open area for a few minutes, observing how it behaves under normal conditions is advisable if the mower runs smoothly without any problems; congratulations! You’ve successfully resolved the issue of water in the gas tank. If you encounter persistent problems, further investigation may be needed, possibly requiring professional service.
Step 9: Routine Maintenance
Establish a regular maintenance schedule for your lawn mower to prevent future water contamination. This includes checking the gas tank for signs of water or debris, ensuring that fuel is stored correctly, and using high-quality gasoline. Consider using a fuel stabilizer, especially if you tend to leave gasoline in the tank for extended periods. Routine maintenance will not only preserve the longevity of your mower but also enhance its overall performance.
Step 10: Store Properly

After you’ve finished mowing, store your lawn mower properly to prevent water from getting back into the gas tank. Keep it covered in a dry area, especially during rainy seasons, and consider using a storage container or shed. During extreme weather changes, check the fuel regularly and drain it if needed. Proper storage habits will contribute to the mower’s reliability and efficiency, making your lawn maintenance tasks hassle-free in the long run.
By following these steps, you can effectively remove water from your lawn mower’s gas tank and prevent any potential engine damage.
5 Things You Should Avoid
- Using Non-Approved Chemicals: Avoid introducing chemicals that are not explicitly designed for fuel systems. Some solvents can react adversely with gasoline or the materials used in the fuel system, potentially causing damage.
- Neglecting Safety Precautions: Always prioritize safety when working with gasoline. Avoid working in poorly ventilated areas, and never smoke or create open flames nearby. Use appropriate protective gear, such as gloves and goggles.
- Overlooking Routine Checks: Don’t skip regular inspections of the gas tank for signs of water or debris. Proactive measures can prevent more significant issues and save you from spending time and money on repairs.
- Attempting to Start the Mower with Water in the Tank: Never try to start your mower if you suspect there is still water in the fuel. Doing so can lead to severe engine damage and further complications requiring professional service.
- Ignoring Manufacturer Recommendations: Avoid disregarding the lawn mower manufacturer’s guidelines regarding fuel and maintenance. Following these recommendations ensures that your mower operates effectively and safely, reducing the likelihood of fuel-related issues.
By avoiding these common mistakes, you can effectively maintain a functional and reliable lawn mower, keeping your lawn looking neat all season long.
What Happens if Water Enters the Fuel Tank?

When water contaminates the fuel tank of your lawn mower, it can lead to a series of detrimental effects on the engine’s performance. Initially, the presence of water can cause the mower to start difficulty or not at all, as the water disrupts the normal combustion process essential for ignition.
If the engine does manage to start, it may run erratically, producing sputtering, stalling, or a decrease in power, as water interferes with the fuel-air mixture. Over time, consistent operation with water in the tank can lead to severe engine damage, including corrosion of internal components, fuel line blockages, and the potential for permanent failure.
Additionally, water can promote the growth of algae and bacteria in the fuel system, further complicating repairs and leading to costly maintenance. Addressing water contamination promptly is crucial to avoid these complications and ensure the longevity of your lawn mower.
Conclusion
Successfully removing water from your lawn mower’s gas tank is essential for maintaining optimal engine performance and preventing potential damage.
By carefully following the outlined steps on how to get water out of lawn mower gas tank—draining the tank, cleaning the fuel system, and monitoring the mower’s behavior—you can effectively eliminate water contamination. Adopting routine maintenance practices and ensuring proper storage will safeguard against future issues. Remember to always adhere to safety precautions and manufacturer guidelines while addressing fuel-related concerns.
With these measures in place, you can enjoy hassle-free mowing, helping to keep your lawn healthy and well-kept throughout the seasons.
Occupation: Expert in Hardware Tools
Education: Bachelor’s Degree in Mechanical Engineering
Profile:
Enrique Howard is a seasoned expert in the field of hardware tools, with a robust background in mechanical engineering that underpins his extensive knowledge and skills. Holding a degree in mechanical engineering, Enrique has cultivated a deep understanding of tool design, mechanics, and the intricacies of various hardware applications. His educational foundation empowers him to innovate and refine tools that enhance efficiency and effectiveness in a wide range of industries.
Professional Focus:
Enrique’s professional focus encompasses a diverse array of areas within the hardware tools sector, including:
- Tool Design and Development: Leveraging his engineering expertise, Enrique specializes in designing tools that meet specific user needs, ensuring optimal performance and durability.
- Material Science: Understanding the properties of various materials allows him to recommend the best tools for specific applications, enhancing safety and efficiency.
- Ergonomics: He emphasizes the importance of ergonomic design in tools, striving to create solutions that reduce user fatigue and improve comfort during prolonged use.
- Sustainability: Enrique is committed to promoting environmentally friendly practices in tool manufacturing, advocating for the use of sustainable materials and processes.
- Education and Training: Through workshops, seminars, and written content, he focuses on educating both professionals and DIY enthusiasts about tool selection, maintenance, and safe usage practices.
Throughout his career, Enrique has worked on numerous projects, collaborating with manufacturers and craftsmen to develop cutting-edge hardware solutions. His expertise spans from traditional hand tools to advanced power tools, allowing him to contribute significantly to both professional and DIY communities.
As an author, Enrique shares his insights through articles, guides, and tutorials, aimed at helping enthusiasts and professionals alike navigate the complexities of hardware tools. His passion for education and practical application drives him to continually explore new technologies and methodologies, making him a trusted voice in the hardware industry.
Whether he’s writing about the latest tool advancements or providing practical tips for tool maintenance, Enrique Howard is dedicated to empowering others with the knowledge and skills necessary to excel in their hardware endeavors.