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Have you ever found yourself in the middle of a satisfying cleaning session, only to be interrupted by the sudden, erratic behavior of your pressure washer? You’re not alone!
This phenomenon, known as “pressure washer surging,” has left many users scratching their heads and wondering how to restore the smooth, powerful flow they once knew.
It is a much more common problem than you might think. However, we have compiled common causes of this nuance and expert tips on how to fix it.
Understanding Pressure Washer Surging
Fluctuating water pressure in a pressure washer causes surging. This fluctuation results in alternating high and low pressure over a short period of time.
This can be quite annoying, as it can affect the cleaning efficiency of your pressure washer and make it difficult to remove dirt and grime effectively.
Pressure washer surging can be quite frustrating, whether it happens while the machine is idle or under load.
Pressure Washer Surging When Idle
Sometimes, pressure washers decide to act up even when they’re just sitting idle. This can be due to a few pesky issues like blocked filters, clogged carburetors, or defective spark plugs. These problems can hinder the engine from running smoothly.
To get your pressure washer working properly again, clean any clogged parts thoroughly. If needed, replace them.
Pressure Washer Engine Surging Under Load
If your pressure washer is surging while it’s working hard under load, it might be facing a different challenge. A faulty unloader valve could be the culprit here. When the unloader valve isn’t doing its job, the pressure inside the pump builds up.
If the pressure gets too high, it can overpower the engine, causing it to stall. To fix this issue, take a close look at the unloader valve and replace it if needed. Your pressure washer will be back to its powerful self in no time!
What Causes a Pressure Washer to Surge?
Pressure washers surging can be a common issue for both electric and gas pressure washers.
Electric Pressure Washer Surging: Causes & Fixes
Surging in an electric pressure washer refers to the inconsistent flow of water pressure, which may affect its performance. Here are some common reasons for surging and steps on how to fix them:
1. Clogged Nozzle
A clogged nozzle can cause the pressure washer to surge as it restricts the flow of water.
Steps to fix:
- Turn off the pressure washer and disconnect it from the water supply.
- Remove the nozzle from the pressure washer.
- Use a small needle or pin to clean out any debris or dirt from the nozzle.
- Rinse the nozzle with water to ensure it is completely clean.
- Reattach the nozzle to the pressure washer and reconnect the water supply.
- Test the pressure washer to ensure the surging issue is resolved.
2. Malfunctioning Unloader Valve
The unloader valve regulates the pressure and flow of water in the pressure washer. A malfunctioning unloader valve can result in surging.
Steps to fix:
- Turn off the pressure washer and disconnect it from the water supply.
- Locate the unloader valve on your pressure washer (check the user manual if necessary).
- Remove the unloader valve from the pressure washer.
- Clean the unloader valve and inspect it for any damage. If damaged, replace it with a new one.
- Reinstall the unloader valve and reconnect the water supply.
- Test the pressure washer to ensure the surging issue is resolved.
3. Blocked Hose or Filter
A blocked hose or filter can restrict water flow, causing the pressure washer to surge.
Steps to fix:
- Turn off the pressure washer and disconnect it from the water supply.
- Inspect the hose for any kinks or blockages. If any are found, straighten the hose or remove the blockage.
- Remove and clean the filter (refer to the user manual for instructions on removing the filter).
- Reattach the hose and filter to the pressure washer and reconnect the water supply.
- Test the pressure washer to ensure the surging issue is resolved.
We recommend using an inlet water filter for your pressure washer. An inlet mesh filter is a crucial accessory for pressure washers, designed to prevent debris and impurities from entering the pump.
By attaching this filter to the water inlet, you can ensure a consistent water flow and minimize the risk of pressure washer surging.
This easy-to-install and low-maintenance filter not only prolongs the life of your pressure washer but also enhances its overall performance for a seamless cleaning experience.
M MINGLE Pressure Washer Inlet Filter
- Connects to pressure washer inlet
- Prevents blockage
- Protects pressure washer parts
- 3/4 inch GHT male & female thread
4. Insufficient Water Supply
An insufficient water supply can cause the pressure washer to surge as it struggles to maintain consistent pressure.
Steps to fix:
- Ensure the water supply is turned on fully.
- Check the water supply hose for any kinks or blockages, and fix them if needed.
- Verify that the water supply meets the minimum requirements specified in the pressure washer’s user manual.
- If using a water tank, ensure it is filled and the water level is sufficient.
- Test the pressure washer to ensure the surging issue is resolved.
Gas Pressure Washer Surging: Causes and Fixes
1. Jammed Unloader Valve
A jammed unloader valve can cause surging in a gas pressure washer. The unloader valve regulates the pressure in the pump. It does this by redirecting water flow when the spray gun is not in use.
How to fix a jammed unloader valve:
- Turn off the pressure washer and disconnect it from the water supply.
- Locate the unloader valve, which is usually found near the pump or on the side of the pressure washer.
- Remove the unloader valve by unscrewing it or following the instructions provided in your pressure washer’s manual.
- Inspect the unloader valve for any signs of damage or debris. Clean the valve with a soft brush or cloth. Remove any debris or dirt that may be causing it to jam.
- Reassemble the unloader valve and reinstall it on the pressure washer.
- Reconnect the water supply and start the pressure washer to test if the surging issue has been resolved.
2. Restricted Carburetor
A restricted carburetor can cause a gas pressure washer to surge at idle. The carburetor is responsible for mixing air and fuel in the right proportion for combustion.
Over time, dirt and debris can accumulate in the carburetor, restricting the flow of fuel and causing surging.
How to fix a restricted carburetor:
- Turn off the pressure washer and disconnect the spark plug wire for safety.
- Locate the carburetor, which is usually found near the engine.
- Remove the carburetor by following the instructions provided in your pressure washer’s manual.
- Disassemble the carburetor and clean all its components using a carburetor cleaner or a mixture of warm water and mild detergent. Use a soft brush or cloth to remove any debris or dirt.
- Reassemble the carburetor and reinstall it on the pressure washer.
- Reconnect the spark plug wire and start the pressure washer to test if the surging issue has been resolved.
3. Degraded Fuel
Degraded fuel can cause a gas pressure washer to surge at idle. Over time, gasoline can lose its volatility and become less effective, resulting in poor engine performance and surging.
How to fix degraded fuel:
- Turn off the pressure washer and disconnect the spark plug wire for safety.
- Drain the old fuel from the pressure washer’s fuel tank.
- Clean the fuel tank using a fuel tank cleaner or a mixture of warm water and mild detergent. Rinse the tank thoroughly and allow it to dry completely.
- Refill the fuel tank with fresh gasoline, preferably with a fuel stabilizer to prevent future degradation.
- Reconnect the spark plug wire and start the pressure washer to test if the surging issue has been resolved.
4. Clogged Fuel or Air Filter
A clogged fuel or air filter can cause a gas pressure washer to surge at idle. The fuel filter prevents debris from entering the carburetor. The air filter ensures clean air enters the engine. This clean air is needed for combustion.
Over time, these filters can become clogged, restricting the flow of fuel and air and causing surging.
How to fix a clogged fuel or air filter:
- Turn off the pressure washer and disconnect the spark plug wire for safety.
- Locate the fuel and air filters, which are usually found near the engine or carburetor.
- Remove the filters by following the instructions provided in your pressure washer’s manual.
- Inspect the filters for any signs of damage or debris. If the filters are reusable, clean them using a soft brush or cloth, and remove any debris or dirt. If the filters are disposable, replace them with new ones.
- Reinstall the filters and reconnect the spark plug wire.
- Start the pressure washer to test if the surging issue has been resolved.
Final Thoughts
Pressure washer surging is a common issue. It affects both gas and electric pressure washers. This can significantly reduce their performance.
By understanding the potential causes of surging, such as clogged nozzles, malfunctioning unloader valves, blocked hoses or filters, and insufficient water supply, you can effectively troubleshoot and resolve these problems.
One common issue that affects both types of pressure washers is air in the system. To fix this issue, ensure all connections are tight, turn on the water supply, and pull the trigger on the spray gun to release any trapped air.
By regularly maintaining your pressure washer and addressing these potential issues, you can ensure optimal performance and extend the life of your equipment.
Read more: Complete Pressure Washer Maintenance Guide.
Frequently Asked Questions (FAQ)
Q: Can pressure washer surging damage my pressure washer?
A: While occasional surging may not cause immediate damage to your pressure washer, continuous surging can put unnecessary strain on the pump and other components, potentially leading to premature wear and tear. It’s essential to address surging issues promptly to ensure the longevity of your pressure washer.
Q: How often should I check and clean my pressure washer’s filters?
A: It’s a good practice to inspect your pressure washer’s filters before each use, especially if you use your pressure washer frequently or in environments with a lot of dirt and debris. Regularly cleaning or replacing the filters as needed will help maintain optimal water flow and prevent surging issues.
Q: Can I use any type of water source for my pressure washer?
A: It’s essential to use a clean and reliable water source for your pressure washer. Ideally, you should use a water source with a sufficient flow rate to meet your pressure washer’s requirements. Avoid using water from ponds, lakes, or other sources that may contain debris, as this can clog your filters and cause surging issues.
Q: What should I do if I can’t fix the surging issue myself?
A: If you’ve tried troubleshooting the surging issue using the tips provided in this blog and still can’t resolve the problem, it’s best to consult your pressure washer’s manual or contact the manufacturer for further assistance. You may also consider seeking help from a professional technician specializing in pressure washer repair.
Q: Can I prevent pressure washer surging entirely?
A: While it’s not possible to guarantee that your pressure washer will never experience surging, regular maintenance and proper care can significantly reduce the likelihood of this issue occurring.
By following the tips provided in this blog and addressing any potential problems promptly, you can minimize the chances of surging and keep your pressure washer running smoothly.
Q: Does using hot water in my pressure washer increase the chances of surging?
A: Generally, using hot water in your pressure washer should not directly cause surging issues. However, it’s essential to ensure that your pressure washer is designed to handle hot water, as not all models are compatible with hot water use.
If your pressure washer is not designed for hot water, using hot water can damage internal components and potentially lead to surging or other performance issues. Always consult your pressure washer’s manual or contact the manufacturer to confirm whether your model is suitable for hot water use.
