Learning how to remove gas from a lawn mower is a basic skill every homeowner should know. Safely removing fuel from your mower’s tank is necessary before many storage or repair tasks. Whether you’re winterizing your equipment, fixing a carburetor, or just dealing with old gas, doing it correctly protects your engine and keeps you safe.
This guide will walk you through the simplest and safest methods. We’ll cover the tools you need and common mistakes to avoid. You’ll be able to tackle this job with confidence in no time.
How To Remove Gas From A Lawn Mower
There are several reliable ways to get gasoline out of your mower’s fuel tank. The best method for you depends on the tools you have available and the specific situation. Below, we outline the three primary techniques, starting with the most common and accessible approach.
Method 1: Using A Siphon Pump (The Easiest Way)
A manual siphon pump is the most efficient tool for this job. It’s inexpensive, available at any auto parts store, and keeps you from having to tip the mower. This method is clean and minimizes the risk of spills.
Here are the steps to follow:
- Gather your materials: a manual siphon pump kit, an approved gasoline container, safety glasses, and gloves.
- Move the lawn mower to a flat, well-ventilated area outside, away from any sparks or open flames.
- Place your empty gas can on the ground, lower than the mower’s fuel tank.
- Insert the pump’s longer tube into the mower’s gas tank until it reaches the bottom.
- Put the shorter tube into your empty gas can.
- Pump the bulb or use the primer mechanism according to the pump’s instructions until fuel begins to flow steadily into the can.
- Once the tank is empty, remove the tubes carefully, allowing any residual gas to drip into the can.
Method 2: The Gravity Drain (When A Fuel Line Is Present)
Many lawn mowers have a fuel line connecting the gas tank to the carburetor. If your model has one, you can often use gravity to your advantage. This method is straightforward but requires a bit more preparation.
- Again, ensure you are in a safe, outdoor location with your empty gas can ready.
- Locate the fuel line. It’s usually a small rubber or plastic hose running from the bottom of the gas tank to the carburetor.
- Place a small pan or bowl underneath the connection point at the carburetor or the fuel tank outlet.
- Using pliers if necessary, loosen the clamp securing the fuel line and carefully disconnect the hose from the carburetor end.
- Direct the open end of the fuel line into your gas can. The fuel should begin to flow out on its own due to gravity.
- If the flow is slow, you can gently lower the gas can to increase the height difference. Never blow into the line to start the flow.
- Once drained, reconnect the fuel line and secure the clamp.
What To Do If The Fuel Line Is Dry
Sometimes, if the mower has been sitting, the fuel line might be dry and gravity won’t start the flow. In this case, you can try briefly opening the gas cap to allow air in, which can break the vacuum. If that fails, you may need to use the siphon method or proceed to method three.
Method 3: Manual Removal With A Turkey Baster Or Syringe
For small quantities of gas or for mowers with very small tanks, a simple hand-operated tool can work. A dedicated fluid syringe or even a new, clean turkey baster can be used. This is a last-resort method and requires extreme caution.
- Important: Only use tools made of materials compatible with gasoline. Never use something that could degrade or create a static spark.
- Insert the tube into the tank, squeeze the bulb to create suction, and draw the fuel out.
- Transfer it slowly to your gas can, avoiding any splashing.
- This method is slow and best for removing a final bit of fuel after a primary draining.
Essential Safety Precautions You Must Follow
Gasoline is highly flammable and its vapors are explosive. Your safety is the absolute priority. Ignoring these precautions can lead to serious injury or property damage.
Work In A Ventilated Outdoor Area
Always perform this task outside. Never in a garage, shed, or basement. Gasoline vapors are heavier than air and can accumulate, creating a major fire hazard. Good airflow helps disperse these dangerous vapors quickly.
Let The Engine Cool Completely
If the mower has been running, wait for the engine and exhaust system to cool down entirely. A hot engine component can easily ignite gasoline or its vapors. It’s best to do this task on a cold engine, first thing in the morning.
Use Approved Containers And Tools
Only store gasoline in containers specifically designed and certified for that purpose. These are usually red plastic cans with a flame arrestor in the spout. Using makeshift containers like milk jugs or glass jars is extremely dangerous and illegal in many places.
Have Fire Safety Equipment Nearby
Keep a class B fire extinguisher within reach. Also, avoid having any potential ignition sources nearby, including cigarettes, pilot lights, electrical tools, or even a cell phone that could spark.
What To Do With The Old Gasoline
You’ve successfully removed the fuel, but now you have a container of old gas. You cannot simply pour it down a drain or onto the ground. This is both environmentally harmful and illegal.
How To Check If Gas Is Bad
First, assess the fuel. Old gasoline degrades, losing its combustibility and forming varnish and gums. Signs of bad gas include a sour smell, a darker color, and separation. If it’s less than a month old and was treated with a stabilizer, it might be okay to reuse.
Safe Disposal Options
Most communities have hazardous waste collection facilities or events. Contact your local government’s waste management department for instructions. Some auto parts stores or service stations may also accept old gasoline for a fee. Never mix it with oil for disposal unless instructed to do so by the collection facility.
Common Mistakes And How To Avoid Them
Even with good intentions, it’s easy to make errors during this process. Being aware of these common pitfalls will help you succeed.
- Tipping The Mower Incorrectly: Tipping the mower to pour gas out can cause oil to flood the air filter and cylinder, leading to starting problems. If you must tip it, always tip it with the carburetor and air filter facing upward.
- Using Improper Siphoning Techniques: Never start a siphon by sucking on a tube with your mouth. Gasoline is toxic and can cause severe health issues. Always use a pump.
- Forgetting To Stabilize Remaining Fuel: If you leave a little gas in the tank over winter without stabilizer, it will still degrade and cause problems. For long-term storage, it’s best to run the engine dry or use a fuel stabilizer in a full tank.
- Overlooking Local Regulations: Disposal rules vary. Failing to follow your local laws for hazardous waste can result in fines. Always check first.
Frequently Asked Questions
How Do You Get Gas Out Of A Lawn Mower Without A Siphon?
If you don’t have a siphon, you can use the gravity drain method by disconnecting the fuel line. For a very small amount, a fluid syringe is an option. As a last resort, you can carefully tip the mower with the air filter side up and pour the gas into a can using a funnel, but this method carries a higher risk of spills and engine issues.
Can I Leave Gas In My Lawn Mower Over Winter?
It is not recommended. Untreated gasoline will break down over several months, forming gums that clog the carburetor’s tiny jets and passages. This is the leading cause of lawn mowers that won’t start in the spring. Either remove the gas entirely or fill the tank and add a fuel stabilizer.
What Is The Best Way To Drain A Lawn Mower Gas Tank For Storage?
The best practice is to use a siphon pump to remove most of the fuel. Then, you can either run the engine until it stops to use up the fuel in the carburetor bowl, or you can disconnect the fuel line to let the last bit drain out. This leaves the system nearly empty and prevents stale gas issues.
Is It Safe To Use A Vacuum To Remove Gasoline?
No, it is extremely dangerous. Never use a standard wet/dry vacuum or any electrical appliance to remove gasoline. The motor can create sparks, igniting the vapors and causing an explosion. Only use tools designed for flammable liquids.
How Long Does It Take To Drain Gas From A Lawn Mower?
With a siphon pump, draining a typical 1-2 gallon tank takes only a few minutes. The gravity method may take a bit longer, around 5-10 minutes, depending on the hose diameter. The entire process, including setup and safe container handling, should take about 15-20 minutes for a typical homeowner.