Part of proper pressure washer maintenance means correctly storing your pressure washer during the off-season. There are several steps to proper storage, but first let’s begin with a few simple dos and don’ts:

• DO NOT store a pressure washer near heat or ignition sources.

• DO NOT store fuel from one season to the next unless properly treated with fuel stabilizer.

• DO NOT place a storage cover on a hot pressure washer. Let the unit cool to room temperature prior to storage.

• DO replace the fuel container if rust is present. Rust in fuel will cause fuel system issues.

• DO cover the unit with a suitable protective, moisture resistant cover.

• DO store the unit in a clean and dry area.



In addition, there are four steps that you should follow to ensure your pressure washer will be ready to go next season. 

1. Prepare Fuel System for Storage 

A pressure washer that is being stored long-term will require some sort of fuel maintenance. Fuel that has been stored for over thirty days can go bad and damage key components on your pressure washer. If possible, drain the remaining fuel into an approved container, like a gas can.. If that’s not possible, add fuel stabilizer to prevent the gas from breaking down and gumming up engine components. After adding the stabilizer, run the engine for about ten minutes to be sure it circulates throughout the engine. Adequately prepared fuel can be stored up to 24 months.

2. Prepare Engine for Storage

In order to prepare the engine for storage, you will first need to change the oil, which will be discussed in the next step. Then you will need to remove the spark plug, and pour a tablespoon of clean engine oil or spray of suitable fogging agent into the cylinder, pulling the recoil start several times to distribute the oil in the cylinder. Finally replace the spark plug, and pull the recoil slowly until resistance is felt to prevent moisture from entering the cylinder then release.

3. Change Oil

Changing the oil regularly is an important part of annual maintenance, but it’s even more important prior to storage. Changing the oil eliminates moisture and corrosion, preventing excessive wear, which can lead to power loss, poor fuel economy, and possible engine failure. After changing the oil according to the manufacturer’s recommendations, remove the spark plug, and pour a tablespoon of clean engine oil into the cylinder. Pull the recoil start several times to distribute the oil in the cylinder. Replace the spark plug, and pull the recoil slowly until resistance is felt to prevent moisture from entering the cylinder.

4. Prepare Pump for Storage

Preparing your pump for storage is especially important in colder temperatures. Turn off the engine, fuel valve, and water supply. Then point the spray gun in a safe direction and squeeze the trigger to relieve any trapped pressure. Disconnect all hoses and drain water from the hoses, spray gun, and lance. Empty the pump of all remaining liquids and pull the recoil about six times to remove any remaining liquid from the pump. Finally, winterize your pressure washer pump with Generac Pump Shield™ to limit cold damage and lubricate pistons and seals.


By following these simple steps, you can safeguard your pressure washer for use next season. If you have any questions, you can contact our customer support team at 888-GENERAC (436-3722). We're available 24 hours a day, 7 days a week.