When a pressure washer is not functioning properly, it can be a sign that the Trigger Shut Off Valve has failed. You can check this valve by using a pressure washer that has a gauge. It should spike between 6% and 9% of the working pressure. If it is higher, try adjusting the pressure settings again. You might also want to replace the O-ring, which seals the oil pump. If this is damaged, it will shut off the unit.

Unloader valve

Whether the trigger is not working or the water is spraying everywhere, you can resolve this problem by replacing the unloader valve. This valve has different parts, and disassembling it will reveal the problems. To do this, you will need a wrench or screwdriver. Disassemble the valve and inspect the piston, O-rings, and spring. Adjust the pressure settings to ensure the correct operation of the valve.

The unloader valve is a mostly black valve that is used to direct the water in the pressure washer’s loop. If it is malfunctioning, the pressure washer will stall due to the buildup of pressure. Fortunately, this problem is relatively easy to fix. The replacement valve has the same size O-rings as the old one. After fixing the unloader valve, You can do the replacment triger shut off valve with a new one.

Clogged carburetor

A clogged carburetor is the number one reason for your pressure washer motor not running properly. You may have used old fuel for the pressure washer for some time. The constituents of this fuel evaporate over time and form a thick, sticky substance that chokes the carburetor and causes it to stall, sputter out, or even seize up. Before replacing the carburetor, drain the old fuel and clean it thoroughly. If the problem persists, you may need to replace the fuel filter or carburetor.

A plugged carburetor is another cause of a non-starting pressure washer. The carburetor prevents the fuel and air from mixing together properly. If the fuel and air mixture are imbalanced, the pressure washer engine will not work properly. You’ll hear popping or sneezing sounds as well as see black smoke coming out of the exhaust. Another problem is that the fuel bowl is clogged. If the fuel bowl is clogged, the needle valve may not close properly.


When the water temperature inside your pressure washer is too hot, the engine will overheat. Changing the thermostat on your pressure washer is a good way to prevent this problem. Overheating your power washer can damage its internal components and a replacement valve is an easy way to prevent it. But how do you tell if it is the cause of your problem? Here are a few tips to help you determine if it is a thermostat malfunction.

Ensure that the thermal relief valve is functioning properly. It helps prevent overheating the engine by directing cold water back into the engine. If the temperature reaches over 145oF, the packing seal can be damaged and the engine will overheat and begin to give off smoke. If the water temperature is too high, the motor will start to short out due to meltdown of the motor winding insulation, causing the engine to malfunction and overheat.

Re-installing O-rings

If the O-ring on your pressure washer has been damaged, it’s probably time to replace it. Fortunately, re-installing O-rings is relatively easy. It’s important to remember that you should never use the wrong tools to install O-rings. This can damage your pressure washer and make it unusable. Use a wrench to insert the O-ring properly, and be sure to keep the pressure washer shut off valve open while performing this task.

If you’re not sure how to do this repair, check the O-rings that seal the outlet coupling between the pressure washer pump and the trigger wand. If the O-ring is damaged, remove the coupling by using an ice pick or screwdriver. If you can’t remove the O-rings, you can use long-nose pliers to pull them out. Next, buy new ones from a supply store. Once the new ones are in place, use your finger to make sure that they are properly sealed.

Checking for a leak in the oil pump

If your pressure washer suddenly shuts off, it might be due to a leak in the oil pump. The unloader valve is responsible for preventing water from leaking out of the pump. The valve has a spring and a piston attached to it. If the piston is obstructed, the valve will not function properly and shut down the pressure washer. The water inlet should also be in good working condition.

Occasionally, you can check for leaks by checking the rubber O-rings. A cracked or brittle O-ring may be causing pressure loss. To fix this, you can replace the rings with a new set of identical ones of the same size and thickness. If the leak continues to persist, you may have made a critical error last season.

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Bruce is one of the most well-traveled people you will ever meet. He has visited every continent on the planet and loves to shop in every country he visits. His favorite pastime is finding unique items that no one else has, and bringing them back home to share with his friends and family.


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