How to Store a Pressure Washer for Winter Without Damaging the Pump

Josh Summerhays • September 24, 2026

A pressure washer is easy to roll into a corner once the last outdoor jobs of the season are finished. The trouble is, leaving water in the pump or untreated fuel in a gas-powered model can cause problems when you need it again. Winter storage requires a little more preparation than simply disconnecting the hose.

The most important jobs are removing water, preparing the pump, handling fuel correctly on gas models, and letting the machine dry before storage. If you're also clearing seasonal equipment out of a crowded garage, our storage options in Mount Airy include ground-floor, drive-up units ranging from 5x10 to 10x30 on North Andy Griffith Parkway.

Start With Your Pressure Washer's Manual

Pressure washers don't all have the same winterization procedure. Gas and electric models differ, and manufacturers may specify a particular pump protectant, fuel procedure, or maintenance schedule. Start with the owner's manual for your machine rather than treating a general checklist as a substitute for its instructions.

Manufacturer guidance makes the reason clear. Some manufacturers warn that freezing temperatures can permanently damage a pressure washer pump if water remains inside, while others recommend draining pressure washers, treating the pump with a protective product, and keeping the machine in a dry location protected from subfreezing temperatures. That means winter preparation should happen before the machine is tucked away for the season. Once it's disconnected, drained, and dry, you have much less to worry about while it sits unused.

Clean the Pressure Washer Before Storage

Mud, grass, detergent residue, and grime shouldn't spend several months sitting on the machine. Give the exterior a basic cleaning after the final use, paying attention to the frame, wheels, spray wand, hose, and connections. Let everything cool first if you've been using a gas-powered machine.

Check the nozzle and lance for debris according to your manufacturer's maintenance directions. If the machine has a removable detergent tank, empty and rinse it before storage. We recommend rinsing removable detergent tanks after use, while its winter-storage guidance calls for emptying detergent from the system before putting the equipment away. Once it's clean, allow the pressure washer and its accessories to dry. Don't put a cover over a machine that's still hot or damp. Most storage instructions call for allowing the unit to cool before covering it and keeping it in a clean, dry area.

Drain the Water From the System

Water left inside the pressure washer is one of the main winter-storage concerns. When water freezes, it expands. Inside a pump, hose, spray gun, or lance, that expansion can damage components that weren't designed to accommodate it. After shutting off the machine and water supply, relieve trapped pressure according to the instructions for your model. Disconnect the hoses, spray gun, and lance, then drain the remaining water from each component. Don't forget the hose simply because it has been disconnected. Water can remain trapped in low spots or coils.

The pump itself also needs attention. For example, most manufacturers instruct owners of certain gas-powered models to drain the components and remove remaining liquid from the pump before adding the specified pump-protection product. Electric models can have different procedures, so follow the manual rather than applying gas-engine instructions to an electric machine.

Protect the Pump

Draining gets rid of much of the water, but the manufacturer's winterization procedure may call for a pump-protection product as an additional step. These products are intended to protect internal pump components during storage and reduce the risk of freeze damage. The correct product and method depend on the machine. This isn't a step where improvising pays off. Check the manual for the pressure washer you own and use only a product and procedure appropriate for that model.

Prepare the Fuel System on a Gas Pressure Washer

Gas-powered pressure washers have another winter-storage issue: fuel sitting in the system for months. We recommend addressing the fuel system when storing a pressure washer for more than 30 days. Depending on the model and manufacturer's instructions, that may mean properly treating the fuel with stabilizer or draining it. If the manufacturer permits fuel stabilizer, follow its directions for adding and circulating the product through the system.

If the fuel isn't being treated, follow the manufacturer's procedure for draining it into an approved container. Gasoline requires careful handling, so don't drain fuel inside a storage unit or enclosed room. Some gas models also require engine maintenance before long-term storage, such as an oil change or cylinder preparation. Those steps vary by engine, which is another reason to keep the owner's manual involved from start to finish.

Coil the Hose Instead of Folding It

Once the pressure washer itself is ready, spend a few minutes on the accessories. Drain the high-pressure hose completely and coil it without sharp bends or kinks. Store the spray gun and lance where they won't end up underneath boxes or heavier equipment. Keeping the machine and its accessories together also makes spring setup easier. A small container can hold compatible nozzles and other removable pieces so they don't disappear among larger garage or lawn equipment.

If you're organizing several seasonal tools at once, leave frequently used items toward the front rather than building a wall of equipment around them. Our guide to maximizing the space in a storage unit covers practical ways to use floor and vertical space without making stored items difficult to retrieve.

Choose a Clean, Dry Place for Winter Storage

After winterization, location matters. Pressure-washer manufacturers recommend a clean, dry storage area and protection from freezing temperatures. If you're considering a self-storage unit, check both the equipment manufacturer's instructions and the facility's rules before moving the machine in. A gas-powered pressure washer shouldn't be placed in storage with untreated fuel or other prohibited flammable materials simply because the rest of the machine has been winterized.

Our Mount Airy property is at 1632 N Andy Griffith Parkway, just north of the Fancy Gap Road intersection. Every unit is on the ground floor with drive-up access, so larger seasonal equipment doesn't have to be carried through an interior hallway or taken up an elevator. Our units range from 5x10 to 10x30, and access is available 24 hours a day. That location can also be useful for households rotating outdoor equipment as the seasons change. Mount Airy's Parks and Recreation Department maintains the Granite City Greenway along with local parks that support activities including biking, fishing, and paddling. When warm-weather equipment is put away for winter, keeping it organized rather than crowded into a garage makes it easier to find again when the season changes.

Keep the Pressure Washer Upright and Accessible

Set the pressure washer on a stable surface in its normal operating position unless its manufacturer directs otherwise. Avoid stacking boxes or heavy tools on top of the machine, hose, spray gun, or wand. A fitted or suitable moisture-resistant cover can keep dust off the unit, but only cover it after it has cooled and dried completely.

Leave enough room to reach the machine without unloading half the space. That matters if you decide to inspect it during the winter or need to retrieve another piece of equipment stored nearby. For larger collections of seasonal tools, a simple aisle is usually more useful than squeezing every available inch out of the floor. The same preparation principle applies to other equipment with water connections. If you're rotating appliances during a move or home project, our guide to preparing a washing machine for storage explains how to drain and dry that equipment before putting it away.

Before You Use It Again

When it's time to bring the pressure washer back out, inspect it before reconnecting everything and starting it. Look over the hoses, fittings, spray gun, electrical cord on an electric model, or engine components on a gas model. Follow the manufacturer's procedure for returning the machine to service after storage. Don't assume that a machine is ready simply because it looks the same as it did in the fall. A quick inspection gives you a chance to spot damaged hoses, loose connections, or other problems before the system is pressurized. If pump protectant or another winterizing product was used, follow the manufacturer's startup instructions for that product and machine. The owner's manual should remain the primary reference for both winterization and spring startup.

Make Room for Seasonal Equipment in Mount Airy

A pressure washer doesn't need an elaborate winter-storage routine, but it does need the right one. Drain the water, protect the pump according to the manufacturer's directions, handle fuel correctly on gas models, and keep the equipment somewhere clean and dry. Those steps address the parts of the machine most vulnerable during a long period of inactivity.

If seasonal tools are taking over the garage after they've been prepared for storage, you can explore storage options from Guardian Storage and compare the ground-floor unit sizes available at our Mount Airy property. The right amount of space lets you keep equipment accessible without undoing the careful work you put into preparing it for winter.

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Sentimental or Heirloom Pieces: Family photo albums, keepsakes, or heirloom furniture often carry value that isn’t about money, it’s about memories. A clean, secure storage unit gives you peace of mind knowing those irreplaceable items are protected. Hobby or Business Supplies: Whether it’s crafting materials, sports equipment, or extra inventory for a small business, storage units can help you stay organized while keeping your home clutter-free. Items Better Off Donated or Tossed Just as important as knowing what to keep is recognizing what doesn’t need to come with you. Here are things that are usually better donated or discarded: Clothes You Haven’t Worn in Years If you haven’t reached for it in a year or two, chances are you won’t again. Donating gently used clothing helps others while freeing up space for things you actually wear. Outdated Electronics That drawer of old cords, DVD players, or broken gadgets? Most of those items won’t ever be useful again. 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