How to Drain Gas From a Pressure Washer: Some Helpful Tips


There can be several reasons why you need to drain gas from your pressure washer. If you plan to store it for an extended period, like for the winter. You want to drain the gas before it goes bad. Or you have to do some maintenance where you need to flip the pressure washer. And do not want to spill gas to the floor.

How to Drain Gas From a Pressure Washer:

To drain gas from a pressure washer, you can disconnect the fuel line or use a Siphon Hose. The easiest place to disconnecting the fuel line is near the carburetor. You only need some pliers and a safe gas container. If you have or purchase a siphon hose, it is even easier. Open the fuel cap and suck the remaining gas from the tank. If you plan to store your pressure washer for an extended period, do not forget to drain the gas from the carburetor as well.

How to Drain Gas From a Pressure Washer: Some Helpful Tips 1

In this blog post, I will show you how to drain the gas from a pressure washer. And how you can protect your gas-powered pressure washer when you plan to store it for an extended period. Like for the winter season. Bad gas can make your machine hard to start when you need it.

What is the Easiest Way to Drain a Gas Tank?

The easiest way to drain a gas tank depends on the tools you have at hand. If you have only a limited amount of gas left, you can let your machine just run and use it until it dies. If your pressure washer has a carburetor with a dedicated drain screw. You can loosen the screw and drain the gas that way. If you own a Siphon Hose, using it is the second easiest method. In that case, you only need to open the fuel cap. Another option is to tile the pressure washer and let the fuel drain from the fill cap.

If you are traveling, selling, or storing your gas-powered pressure washer, I recommend draining the gas from the tank. Particular when you plan to store your machine for winter.

The gas used in most gas-powered pressure washers is unleaded gasoline and has an octane rating of 87% or higher. This gasoline also contains ethanol. This ethanol can cause problems and make the gas bad. If the gas is left inside the tank for more than 1 or 2 months, the ethanol in the gasoline can attract water. This can produce an acid that will corrode the inside of the carburetor. And can even damage the fuel lines.

Additionally, in as little as three months, the lighter and more volatile gas components can evaporate. This leaves a sticky residue that can clog the carburetor and the fuel lines. This is called bad gas. It leads to difficulty to start or to run pressure washer at the start of the new season. Draining your gas from the tank and carburetor is the safest way to fix this. Another method is to add some fuel stabilizer to the tank and other gas you are storing.

Drain the gas From the Fuel Tank of a Pressure Washer: 5 easy methods

There are several ways you can drain your pressure washer fuel tank. The five most commonly used methods are:

● Method 1: Use The Remaining Gas:

If the pressure washer gas tank only has a limited amount of gas left, you can use your machine until all is used. If there is still a significant amount of gas in the tank, this is not an environmentally friendly method.

● Method 2: Using The Drain Screw On The Carburetor:

Some pressure washer carburetors have a dedicated drain plug. Using this is a straightforward method to drain both the gas tank and the carburetor. Just unscrew the screw or drain plug and let the gas drain into a gas container.

Keep in mind that not all drain screws on a carburetor also drain the gas from the tank. On some models, it only drains that gas from the carburetor itself.

● Method 3: Drain the Gas Using a Siphon Hose:

Using a siphon hose is an easy method to drain the gas from a pressure washer tank. It also avoids any spillage. You can use the following steps:

– Step 1: Put the hose inside:

If you have an entire siphon hose kit, you can see that the hose that comes with the kit has one end with a brass nozzle attached. This end needs to be dipped inside the gas tank.

– Step 2: Making sure that the hose is at the bottom:

This part is crucial. Suppose the end of the hose isn’t fully at the bottom of the tank. The tank won’t be drained completely.

– Step 3: Clamping the hose:

I recommended securing the hose to the fuel tank’s opening. This way, the pipe doesn’t move or slides out of the tank. There is often a “man clamp” that comes with the siphon kit. Or use a tie wrap or some duck tape to secure it.

– Step 4: Installing the pinch clip:

You can slide the pinch clip onto the hose from the other end. The pinch clip allows you to control the movement of liquid. Suppose you want only to drain a certain amount of gas. Or change the fuel container midway during the process. Pinch the clip and stop the liquid from coming through.

– Step 5: Connecting the bulb valve:

Connect the bulb valve to the other end of the hose. Look for an arrow on the bulb valve. This arrow represents the direction of the flow of liquid. You have to connect the hose to the end the arrow is pointing away from.

– Step 6: Pumping the gas out:

Start pumping the bulb valve. This will suck gas from the tank. You have to pump until the gas from the tank reaches the point on the hose where the pinch clip is attached. Once the gas reaches that point pinch the clip. Then you can remove the bulb valve and pour the gasoline into the fuel container. Ensure that the pressure washer is placed at an altitude higher than the container you are draining the fuel into.

● Method 4: Draining the Gas by Disconnecting the Fuel Line:

The fuel line connects the gas tank to the carburetor. You can use the following steps to drain gas by disconnecting the fuel line:

– Step 1: Required Tools:

You will need a fuel line clamper, a pair of pliers and a fuel storage container.

– Step 2: Finding the fuel line:

Not all gas-powered pressure washers look the same. Some have their fuel tank exposed, while some fuel tanks are covered. Locate the fuel tank. If needed, remove the engine housing. Locate the tuber or pipe going from the side of the fuel tank to the carburetor.

– Step 3: Clamping the fuel line:

To avoid gas spillage, clamp the fuel line. This will only work when it is a flexible tube.

– Step 4: Loosen the fuel line:

Take a pair of pliers and disconnect the fuel line. Often the side of the carburetor is the most accessible location. But the side of the gas tank is fine as well.

– Step 5: Drain the gas into the container:

Ensure that your pressure washer is placed at a higher altitude than your fuel container. This way, the gas can easily drain. Using a funnel can make this process easier. When all the gas is drained, reattach the fuel line.

● Method 5: Tilting the pressure washer over

The last method sounds easy but is often more challenging than you think. It can better be performed with two people. It is limited to pressure washers that can be tilted easily. Before starting, make sure you follow the steps below:

– Step 1: Tilt the pressure washer in the correct direction

Before tilting, make sure that the spark plug wire is disconnected so that there is no risk of your Briggs and Stratton engine starting accidentally. Also, take care that the air filter assembly needs be pointing upwards when tilting the mower. This step is done so that the engine oil does not flow into the fuel tank.

– Step 2: Use a container and funnel

Arrange a plastic container and a funnel to catch the fuel and place it under the fuel cap. Open the fuel cap and allow the fuel to be entirely drained into the container.

– Step 3: Close the fuel cap

Once the container is empty, dispose of the fuel removed and close the fuel cap. Reconnect the spark plug wire.

2 Easy Ways to Drain the Gas from the Pressure Washer Carburetor:

To entirely remove gas from the pressure washer, you also have to drain the fuel from the carburetor. There are two main methods to do this:

● Draining Fuel Using Drain Screw on the Carburetor:

If the engine of your gas pressure washer has a carburetor that has a dedicated drain valve. This is the easiest way to drain the gas from the bowl. Use the following steps:

– Step 1: Locate the drain screw:

Locate the drain screw on your carburetor. It’s usually present on the front of the carburetor.

– Step 2: Unscrew the drain screw:

Unscrew the drain screw with a screwdriver, just enough that the fuel starts pouring out of the valve.

– Step 3: Draining the fuel:

Use a funnel to collect the gas. Depending on the size of your carburetor, it will not be a lot of gas. When it is a really small carburetor, I also have used some kitchen paper to collect the remaining gas without much spillage. If the carburetor is bigger, you can use a flexible tube that you hold against the drain. You have to be fast, and you often see quite some spillage.

● Draining The gas by Removing the Carburetor Bowl:

If your carburetor doesn’t have a drain screw, you have to remove the carburetor bowl to drain the gas from it. The carburetor bowl is connected with a bolt. Unscrew it and remove the bowl. Drain any gas present in the bowl. Reconnect the bowl to the carburetor, and you are done.

Is it Bad to Let a Pressure Washer Run Out of Gas?

In general, if you are planning to store your pressure washer for the winter season, I always recommend draining the gas. You can do this by letting the pressure washer run out of gas. Or by draining it using another method. However, if you use your pressure washer regularly and don’t plan to store it for an extended period, I do not recommend letting it run out entirely. This makes starting the engine harder.

Suppose you use your pressure washer regularly. I recommend keeping some gas in the tank. This makes starting easier, and keeps the fuel lines and carburetor from drying out. When you store your machine for an extended period, this can also happen. But having to deal with bad fuel is worse.

Use fuel stabilizer if you plan to store your pressure washer for an extended time:

Suppose you plan to store your pressure washer for an extended period, like for winter. And you do not want to drain your gas tank completely. You can add some fuel stabilizer with your gas.

Check the manufacturer’s instructions on what the ratio should be. Pour the fuel stabilizer into the gas tank. Start the pressure washer so that the fuel stabilizer can also reach the carburetor. The fuel stabilizer will protect the gas from going bad for up to six months. It will save you from draining your gas tank and carburetor. Do not forget to add it to all stored gas.

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