If you own a pressure washer, you know how convenient and powerful it can be for cleaning a wide range of surfaces. However, one of the most common problems that pressure washer owners encounter is a leaking pump. A leaking pump not only decreases the efficiency of your pressure washer, but it can also lead to more serious damage if left untreated. In this article, we will guide you through the steps you need to take to fix a leaking pressure washer pump.

Firstly, it is important to identify the source of the leak. Leaks can occur in different parts of the pump, such as the pressure relief valve, the water inlet, or the seals. To determine the source of the leak, you can inspect the pump for any visible signs of water leakage, such as water puddles or wet spots. Additionally, you can listen for any unusual sounds or vibrations coming from the pump, as these can indicate a leak.

Once you have identified the source of the leak, you can proceed with the necessary repairs. In some cases, a leaking pump can be fixed by simply tightening any loose connections or replacing worn-out seals. It is important to use the correct tools and follow the manufacturer’s instructions to ensure proper repairs. However, if the leak persists after tightening connections or replacing seals, it may be necessary to replace the entire pump.

Regular maintenance and proper care can help prevent pump leaks in the first place. It is important to clean and inspect your pressure washer regularly, and to check for any signs of wear or damage. Additionally, you should always follow the manufacturer’s guidelines for operating the pressure washer, such as using the recommended cleaning solutions and avoiding excessive pressure.

In conclusion, a leaking pressure washer pump can be a frustrating problem, but with the right knowledge and tools, it can be fixed. By identifying the source of the leak, making the necessary repairs, and following proper maintenance practices, you can keep your pressure washer in top condition and ensure its longevity. Remember, if you are unsure about any aspect of the repair process, it is always best to consult a professional.

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Common Causes of a Leaking Pressure Washer Pump

1. Worn or Damaged Seals: One of the most common causes of a leaking pressure washer pump is worn or damaged seals. Over time, the seals can become worn from the constant pressure and heat generated by the pump. When the seals become worn, they can no longer effectively prevent water from leaking out.

2. Loose or Faulty Connections: Another common cause of a leaking pressure washer pump is loose or faulty connections. If the connections between the pump, hoses, and fittings are not securely tightened, water can leak out. Faulty connections can also result in leaks, as they may not form a proper seal.

3. Cracked Pump Housing: A cracked pump housing can also cause a pressure washer pump to leak. This can occur due to excessive pressure, impact, or wear and tear over time. When the pump housing is cracked, water can escape through the cracks, resulting in a leak.

4. Damaged or Worn O-rings: O-rings are used to create a watertight seal in pressure washer pumps. If the O-rings become damaged or worn, they can no longer effectively seal the pump, leading to leaks. O-rings can wear out over time or become damaged due to improper installation or maintenance.

5. Faulty Pressure Relief Valve: The pressure relief valve is designed to release excess pressure from the pump to prevent damage. However, if the pressure relief valve is faulty or not functioning properly, it can cause leaks. When the pressure relief valve fails to release pressure correctly, it can result in water leaking from the pump.

To fix a leaking pressure washer pump, it is essential to identify the specific cause of the leak. Once the cause is determined, the necessary repairs can be made, such as replacing worn seals, tightening connections, repairing or replacing the pump housing, replacing damaged O-rings, or repairing or replacing the pressure relief valve.

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Note: It is always recommended to consult the manufacturer’s instructions or seek professional assistance when repairing a pressure washer pump to ensure proper safety and functionality.

Worn Out Seals

One common cause of a leaking pressure washer pump is worn out seals. Over time, the seals inside the pump can become worn or damaged, allowing water to leak out. This can happen due to normal wear and tear, or if the pump is not properly maintained.

To fix a leaking pressure washer pump caused by worn out seals, you will need to replace the seals. This can typically be done by disassembling the pump and removing the old seals, and then installing new ones in their place.

Before starting the repair, it’s important to make sure you have the right replacement seals for your specific pump model. You can usually find this information in the pump’s manual or by contacting the manufacturer.

Once you have the replacement seals, you can begin the repair process. Start by shutting off the pressure washer and disconnecting any power sources. Then, remove the pump from the pressure washer and carefully disassemble it, taking note of the seals’ locations.

Next, remove the old seals and clean any surfaces they were in contact with. This will help ensure a proper seal with the new seals. Take care not to damage any of the pump’s components during this process.

Once the pump is clean, you can begin installing the new seals. Carefully place the new seals in their proper locations, making sure they are fitted snugly and correctly. Follow any specific instructions or diagrams provided with the replacement seals.

After the new seals are installed, reassemble the pump, making sure all components are properly aligned and tightened. Double-check that all seals are in their correct positions.

Once the pump is reassembled, reconnect it to the pressure washer and turn on the power. Test the pump to ensure the leak has been fixed. If you still notice any leaks, double-check that all seals are properly installed and consider reaching out to a professional for assistance.

Maintaining your pressure washer by regularly inspecting and replacing worn out seals can help prevent leaks and extend the life of your pump. Regularly cleaning the pump and using the correct type of oil can also help maintain the seals and prevent damage.

Loose or Damaged Fittings

Another common cause of a leaking pressure washer pump is loose or damaged fittings. Over time, the fittings that connect the various components of the pump can become loose or worn out, leading to leaks.

To fix this issue, first, turn off the pressure washer and disconnect it from the power source. Then, visually inspect all of the fittings on the pump for any signs of damage or looseness.

If you find any loose fittings, use a wrench to tighten them securely. Be careful not to overtighten, as this can damage the fittings or strip the threads. If you notice any damaged fittings, they will need to be replaced.

To replace a damaged fitting, you will need to identify the type and size of the fitting and purchase a replacement from a hardware store or online. Follow the manufacturer’s instructions or consult an expert if you are unsure how to properly replace the fitting.

Once all of the fittings are secure and in good condition, reconnect the pressure washer to the power source and turn it on to check for any remaining leaks. If the problem persists, it may be necessary to seek professional help or replace the entire pump.

Cracked Pump Housing

The pump housing is a crucial component of a pressure washer pump. It houses all the internal parts, including the pistons, valves, and seals. If the pump housing gets cracked or damaged, it can lead to leaks and a decrease in pressure.

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Here are the steps to fix a cracked pump housing:

1. Identify the Crack

Inspect the pump housing carefully to locate the crack. It is usually found near the connection points or along the seams. Use a flashlight if needed to get a better view.

2. Clean the Area

Clean the area around the crack using a cloth or brush. Remove any dirt, debris, or grease that might interfere with the repair process.

3. Prepare the Pump Housing

Using a degreaser or mild detergent, clean the entire pump housing to ensure it is free from any contaminants. Rinse it thoroughly and let it dry completely before proceeding.

4. Apply Epoxy Resin

Apply a suitable epoxy resin to the cracked area. Make sure to follow the instructions on the epoxy packaging for the correct mixing ratio and application method. Use a spatula or brush to evenly spread the epoxy over the crack.

5. Allow the Epoxy to Cure

Allow the epoxy to cure as per the manufacturer’s recommendations. This usually takes several hours or overnight. Avoid using the pressure washer during this time.

6. Test for Leaks

Once the epoxy has cured, test for leaks by connecting the pressure washer to a water source and turning it on. Inspect the repaired area closely for any signs of leaks or water seepage.

If the crack is too large or the epoxy repair does not hold, you may need to consider replacing the pump housing. Contact the manufacturer or a professional for further assistance.

Faulty Pressure Relief Valve

Another common cause of a leaking pressure washer pump is a faulty pressure relief valve. The pressure relief valve is designed to release excess pressure from the pump when it reaches a certain level. If this valve is malfunctioning, it can cause the pump to leak water.

To check if the pressure relief valve is the culprit, you will need to inspect it for any signs of damage or wear. Look for any cracks, breaks, or corrosion on the valve. If you notice any of these issues, the pressure relief valve may need to be replaced.

To replace the pressure relief valve, follow these steps:

  1. First, locate the pressure relief valve on your pressure washer pump. It is typically located near the outlet port or on the side of the pump.
  2. Disconnect any hoses or fittings connected to the pressure relief valve.
  3. Use a wrench or pliers to remove the old pressure relief valve from the pump.
  4. Install the new pressure relief valve by screwing it into place.
  5. Reconnect any hoses or fittings that were disconnected.

Once the new pressure relief valve is installed, test your pressure washer to ensure that the leak has been resolved. If the pump is still leaking, you may need to consult a professional for further assistance, as there may be other underlying issues causing the problem.

Preventing Future Issues

To prevent future issues with your pressure washer pump and pressure relief valve, it is important to perform regular maintenance. This includes checking the valve for any signs of damage or wear, as well as cleaning and lubricating the pump on a regular basis. Additionally, make sure to follow the manufacturer’s guidelines for proper use and storage of your pressure washer to avoid putting unnecessary strain on the pump.


A faulty pressure relief valve can cause a pressure washer pump to leak. To fix this, inspect the valve for any signs of damage and replace it if necessary. Regular maintenance and proper use of your pressure washer can help prevent future issues.

Related Topics:
How To Replace A Pressure Washer Pump
Common Pressure Washer Problems and How to Fix Them

Improper Pump Installation

One common cause of a leaking pressure washer pump is an improper installation. If the pump is not installed correctly, it can cause pressure leaks and ultimately lead to a malfunctioning pump.

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During installation, it is important to ensure that the pump is securely attached to the pressure washer frame. The pump should be mounted in the correct orientation, ensuring that all connections are properly aligned.

Another key aspect of proper installation is ensuring that all fittings and connections are tightened securely. Loose fittings can cause leaks and result in a loss of pressure. Care should be taken to tighten all connections without over-tightening, as this can also cause leaks.

Seal and Gasket Inspection

Additionally, it is crucial to inspect the seals and gaskets during the pump installation process. These components are designed to create a tight seal between the pump and other parts of the pressure washer. If the seals or gaskets are worn, damaged, or improperly installed, they can cause leaks.

Inspect the seals and gaskets for any signs of wear or damage, such as cracks or tears. Replace any damaged components before attempting to use the pressure washer. It is also important to ensure that the seals and gaskets are properly seated in their respective positions during installation.

Proper Pump Orientation

Finally, make sure that the pump is installed in the correct orientation. Most pressure washer pumps have an arrow indicating the direction of water flow. The pump should be installed with the arrow pointing in the correct direction, typically towards the spray gun.

Installing the pump in the wrong orientation can cause pressure leaks and result in reduced performance. Double-check the pump’s installation manual or consult the manufacturer’s guidelines for the correct orientation.

Questions and answers

What should I do if my pressure washer pump is leaking?

If your pressure washer pump is leaking, the first step is to identify the source of the leak. You can do this by inspecting the pump for any visible cracks or damaged seals. Once the source of the leak is identified, you can then take the necessary steps to fix it.

Can I fix a leaking pressure washer pump myself?

Yes, you can fix a leaking pressure washer pump yourself. However, it is important to note that fixing a leaking pump can be a complex task and may require some technical knowledge and experience. If you feel confident in your abilities, you can follow a step-by-step guide or seek advice from professionals to fix the pump yourself.

What are some common causes of pressure washer pump leaks?

There are several common causes of pressure washer pump leaks. Some of the most common causes include worn out seals, cracked pump head, loose fittings, or a faulty unloader valve. It is important to identify the specific cause of the leak in order to properly fix it.

Is it possible to prevent pressure washer pump leaks?

While it is not always possible to prevent pressure washer pump leaks, there are some steps you can take to minimize the risk. Regular maintenance, such as checking and replacing worn out seals, tightening fittings, and cleaning the pump regularly, can help prevent leaks. Additionally, using the pressure washer properly and avoiding excessive pressure or strain on the pump can also help prevent leaks.

Should I consider replacing my pressure washer pump if it keeps leaking?

If your pressure washer pump continues to leak despite attempts to fix it, it may be worth considering replacing the pump. Sometimes, leaks can be a sign of more serious underlying issues that cannot be easily fixed. In such cases, investing in a new pump may be a more cost-effective and practical solution.

My pressure washer pump is leaking. How can I fix it?

If your pressure washer pump is leaking, you can fix it by checking and tightening the connections, replacing the seals or o-rings, or replacing the entire pump if necessary.