How to store or winterize a pressure washer
Direct answer: To store or winterize a pressure washer, treat the fuel on gas models, flush the pump with clean water, then drain the hoses, gun and pump. Add a pump saver through the water inlet to guard against rust and freeze damage. Store it clean in a cool, dry place. Always follow your owner's manual first.
Why winterize a pressure washer?
Water left in the pump can freeze and crack parts. Old fuel can also cause trouble. Briggs & Stratton says gas goes stale in about 30 days, and stale fuel can damage parts. A short routine before storage helps the machine start next season.
Read our pressure washer safety guide before you start.
How do you prepare the fuel on a gas model?
Briggs & Stratton says to add fuel treatment to clean, fresh fuel, then run the engine for about two minutes so the treated fuel moves through the system. Then turn it off. Check your engine maker's steps too.
Shopping for a gas model? See our gas pressure washers page.
How do you flush and drain the pump?
- Put the detergent tube in a pail of clean water and run on low pressure for about two minutes.
- Turn off the engine and the water supply.
- Once cool, disconnect the hoses.
- Drain the water from the hose, spray gun and wand.
- On gas models, Briggs & Stratton says to pull the starter cord about six times to empty the pump.
What is pump saver and how do you use it?
Pump saver is a fluid made to protect the pump during storage. Briggs & Stratton says to connect it through a short garden hose, about a yard long, to the water inlet. It says this helps prevent rust and freeze damage and keeps pistons and seals from drying out. Work in a clean area, lay down a tarp, and wear eye protection.
Where should you store it?
Briggs & Stratton says to store the pressure washer clean, in a cool, dry place. Keep it out of freezing spaces if you can. Coil the hose loosely, and keep nozzles together so none get lost. Find more care tips in our guides.
Need parts or add-ons for next season? Browse our pressure washer accessories page.
Frequently asked questions
How do I winterize a pressure washer?
Treat the fuel on gas models, flush the pump with clean water, drain the hoses, gun and pump, add pump saver, and store it in a cool, dry place.
What does pump saver do?
Briggs & Stratton says pump saver helps prevent rust and freeze damage and keeps pistons and seals from drying out.
Should I leave gas in my pressure washer over winter?
Briggs & Stratton says to add fuel treatment to clean, fresh fuel and run the engine for about two minutes. Follow your engine maker's manual.
Where should I store a pressure washer?
Store it clean, in a cool, dry place. Keep it out of freezing spaces when you can.