Written by Julie

How do you remove the gasoline from your lawn mower?

In order to maintain your lawn mower, you should drain the gasoline when you store it for a longer period of time. In this article, I'll tell you how that works.
For which lawn mowers? All gasoline lawn mowers
When? Before storing it for 3 months or more (if you use E10 gasoline, you should do this after 3 weeks)
How long? About 15 minutes
What do you need? An empty jerrycan with a cap, a short plastic hose and a long plastic hose (2.5cm diameter), optional: a siphon pump

Why drain the gasoline?

Old gasoline is bad for the lawn mower. After to months, deposits will sink to the bottom and the fuel quality will be reduced. That's why it's important not to leave the lawn mower out in the shed all winter while there's still old gasoline in it.

Syphoning with two hoses and a rag

Follow the steps below to remove gasoline from the gas tank:

Step 1

Wait for the engine to cool.

Step 2

Siphoning gasoline is done by using gravity. Put the jerrycan on the ground next to the tank cap. The hose should always be lower than the fuel level in the tank to ensure that the gas keeps flowing once it has started.

Step 3

Press the hose deep enough in the gas tank for it to reach the bottom and so it's submerged in gasoline. In order to check if the long hose is submerged, you carefully blow into the hose. Do you hear bubbles? That means it's placed correctly! Place the other end of the long hose in the jerrycan and then place the short hose next to the opening. Don't press the short hose down too far, it shouldn't be submerged.

Step 4

Close the opening. Use an old rag for this and make sure no air can escape. Is there still air escaping? Wet the rag, wring it out, and try again. A damp rag makes it easier to seal the hole.

Step 5

Blow air into the short hose. If you own an air compressor, you can let that do the blowing for you. Be careful not to inhale gasoline vapors. By blowing into the hose, the air pressure in the gas tank increases, forcing air into the longer hose. Blow until the gasoline is flowing to the jerrycan. Stop blowing once the gasoline is flowing and gravity will take care of the rest! Is the jerrycan full or do you want to stop the flow? Lift up the hose or the jerrycan. Once it's above the fuel level, the gasonline will stop flowing.

Step 6

You're done syphoning once all of the gasoline has been drained. Take the hoses from the opening and close the tank. Close the jerrycan as well; gasoline gives off vapors.

Step 7

There'll always be a little bit of fuel left in the engine. Take the lawn mower outside and run the engine until it's all out of gas.

A siphon pump

Siphon pump

As an alternative to this method, you could also use a syphon pump. A manual siphon pump is a long hose with a little pump in the middle of the hose that you use to pump gasoline from the tank. Squeeze the pump a few times to get the gasoline moving. The pumping will cause the gasoline to flow from the tank out of the other end of the hose. With this method, you only use 1 hose and you won't need a rag either. Note that you can only place the hose in the tank in 1 way, since the fluid is only sucked in on one end of the hose. If you use it the wrong way, you'll be blowing air into the gas tank. A mechanical siphon pump is even more convenient; you'll only need to switch it on. Different types of pumps work in different ways, so be sure to always read the manual first.


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