How to Remove Water From Lawn Mower Gas Tank

Water is an essential part of the world that we live in. It may not seem like it to some people, but water can do a lot for us; it provides us with energy and helps regulate our body temperature. But what about when water isn’t doing its job? What if there is too much or too little of it? Well, this article will teach you how to remove water from lawn mower gas tanks and various places where they are needed least.

First, you’ll need to find out how much water is in the tank. If there’s more than an inch of water then the process may take several hours or even days depending on how much water was spilled into the tank. If it’s less than that, then you’re looking at only a few minute’s worths of work before your lawnmower will be ready to use again.

How to Remove Water From Lawn Mower Gas Tank

8 Things You Need to Consider Before Removing Water From Lawn Mower Gas Tank:

Here are some things you need to consider before proceeding to the steps on removing water from the lawn mower gas tank. Be sure to check this out.

1. Spark Plug:

First, disconnect the spark plug wire from the spark plug. If you are unfamiliar with this process, consult your owner’s manual for specific instructions on how to do it.

2. Fuel Priming Bulb:

Some engines have a fuel priming bulb that needs to be removed first before removing water from the lawnmower gas tank.

3. Drain the Gas Tank:

Remove the drain plug from the bottom of the tank and allow any remaining fuel to drain out. Replace plug when finished draining.

4. Turn Off the Lawnmower:

Make sure to turn off the lawnmower before beginning this process.

5. Add a Hose Attachment:

You may need to use a hose attachment or a funnel to reach the opening on your tank if it is too deep. There should be one that came with the lawnmower when you purchased it.

6. Connect a Hose to Opening:

Remove the cap from the open end of the hose and connect it to the lawnmower gas tank valve.

7. Fill Container/sink With Water:

Place the duct-taped funnel into a sink or container that can hold all of the spilled water. You could also use a separate, clean bucket for this purpose.

8. Allow the Gas Tank to Fill:

Turn on the lawnmower and allow it to fill with water until no more mist appears from the opening at the top of the tank.

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Step by Step Guide: How to Remove Water From Lawn Mower Gas Tank

Step by Step Guide How to Remove Water From Lawn Mower Gas Tank

When buying a new lawn mower, ensure it doesn’t already have water in the gas tank. If there is water in the gas tank, follow these steps on how to remove water from the lawn mower gas tank to get rid of it.

Step 1:

Attach one end of the hose to the opening on top of the lawn mower’s gas tank and place the other end in a container or sink that can safely hold any overflow. Next, open the gas valve and allow it to flow until no more mist appears from the top of the tank.

Step 2:

Place the gas cap back on top of the lawn mower’s gas tank. Then, start the lawnmower to run the water out of its system.

Step 3:

Allow the lawnmower to run until it is finished draining all of the water out of its gas tank. Then, place a new container under the lawnmower and disconnect your hose from the gas tank opening.

Step 4:

Please turn off the lawnmower and allow it to sit for a minute. Then, disconnect the gas cap from the lawn mower’s gas tank. Place your hand over where you disconnected the hose and open the valve again to drain any remaining water left in the opening of the gas tank.

Step 5:

Replace both ends of your hose, put the gas cap back on, and start your lawnmower so that all of the water from the gas tank is removed.

Step 6:

Place a new container under the lawnmower to catch any remaining water as it is being drained from the opening of the gas tank. Next, turn off your lawnmower and remove its gas cap.

Step 7:

Place your hand over the opening of the gas tank. Next, open up your lawnmower’s gas valve and remove any remaining water.

Now that you know how to remove water from a lawnmower’s gas tank follow these steps whenever you drain the old gasoline out of your mower before refilling it with fresh, new gasoline.

Tips to Prevent Water From Entering Your Lawnmowers’ Fuel Tank:

Tips to Prevent Water From Entering Your Lawnmowers' Fuel Tank

1. Maintain Your Lawnmower:

Adjust and clean all moving parts; ensure the air filter, oil filler cap, and fuel tank drain caps are tight and secure.

2. Keep Your Mower Out of The Rain:

Place your mower in a shed or garage to prevent exposure to moisture after every use.

3. Store Your Mower With A Dry Fuel Tank:

After each use, drain the fuel tank completely and store your mower with an open gas can to prevent water from entering.

4. Clean Up Spills:

Clean up any gas spills as soon as possible to prevent water from accumulating.

5. Add a Fuel Stabilizer:

Add a fuel stabilizer to your gas can when you fill it up.

6. Keep it Clean:

Never store your mower with leftover fuel in the tank, allowing water to accumulate and rust out the inside of your tank over time.

7. Use a Lawnmower Gas Tank De-Icer:

Add a lawnmower gas tank de-icer to your fuel before every use to reduce the presence of water in the fuel tank by preventing condensation from forming inside your lawnmower’s gas tank.

8 Benefits of Preventing Water From Entering Your Fuel Tank:

1. Prevents upper cylinder corrosion and damage.

2. Reduces the risk of engine seizures or permanent engine damage from rust build-up on pistons, rings, and valves.

3. Helps keep the fuel as a liquid instead of as a sludge which helps improve the efficiency and performance of your mower overall.

4. Prolongs the life of your carburetor and fuel pump.

5. Cleans up easily if done correctly and is easier to fix than engine damage.

6. Improves gas mileage by eliminating air in the gasoline line, which is often reduced when water enters your tank and creates a bubble at the bottom of the container that acts as a block in the line.

7. Prevents gas-line corrosion and fuel injector deposits, both of which can lead to decreased performance, poor engine starting, or rough idling.

8. Helps keep tanks free of sediment by preventing water from sinking to the bottom, where it settles along with dirt and debris that builds up over time.

Why Is There Water in the Lawnmower Gas Tank?

Why There Is Water in the Lawnmower Gas Tank

Water may be present in the mower’s fuel tank due to condensation. In addition, when you store your mower for an extended period, water enters the space where it is stored, which is often humid or damp. Moisture also enters after mowing wet grass or blowing grass clippings into the gas tank by strong winds.

Water-contaminated fuel can cause problems, including engine failure. This is because the water mixes in with the gas in the tank to form a solution that won’t burn properly. This means there is less efficient energy production when you start up your mower each time. You may notice this when starting your lawnmower when the engine backfires or fails to start at all.

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When to Remove Water From Lawnmower Gas Tank?

Water in the fuel should be removed immediately to prevent corrosion and damage to your mower’s engine. Corrosion is the process of deterioration of a material, usually metal, caused by a reaction with its environment. Rust is a type of corrosion that appears as a reddish-brown flaky coating on metal. If left untreated, rust will damage the metal parts in the engine and cause irreparable damage.

When you get stuck in the middle of mowing, and your motor won’t turn over, or if your engine is experiencing trouble accelerating or going up a hill, inspect the spark plugs for any signs of rust. You can also check the oil dipstick to see if it has water droplets floating in it. If there are no signs of corrosion or water in your oil, then you might be able to get the mower started again. However, if all else fails, it’s time to take action and remove water from your gas tank.


The article has provided you with a few tips that can help on how to remove water from lawn mower gas tank. One such suggestion is ensuring the gas cap is tight and in place. Additionally, it may be beneficial for you to use anti-freeze when filling up the mower’s gas tank during winter months or on frigid days.

Lastly, never run your motor without at least some type of fuel in the container as this could lead to rusting inside of the engine, making repairs necessary sooner than later. If there are any other questions, please feel free to reach out! Our team will get back within 24 hours with answers on how best to remove water from a lawn mowers’ gas tank while preventing future leakage into the container.

Louis Wein

Louis Wein

Louis has always been fascinated by cars. He loves the way they look, the sound of the engine, and how they make him feel when he's driving. He is always keen to learn more about different mechanics of cars and how the engine contributes to other aspects of the car. As an automotive technician with over 10 years of experience, he knew how they worked and loved taking them apart to see how they went back together. He was especially interested in the mechanics of combustion engines and loved finding ways to make them more efficient. He loves to work on cars and help people keep their vehicles running smoothly. As a senior editor, he enjoys contributing to Diy quickly because it allows him to share his knowledge and expertise with others.

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