There is a valve spring located inside the unloader that can get rusty. Generally you will find the unloader above the water inlet. Replacing the o-ring in your wand could solve your flow rate problems. The pressure washer wand: The O-ring in a pressure washer spray gun can rust or become damaged.Remove the old O-ring from your outlet coupler and head to the hardware store for a new one. Look to see if there is an O-ring around the plunger if there isn’t, it’s probably lodged in your outlet coupler. The outlet coupler: First, unscrew the outlet coupler a small spring and plunger will pop out.There are two places to check for issues: Low pressure can also result from O-ring problems. You’ll be able to tell right away if the nozzle tip is worn out. The best way to check if the nozzle is worn out is by switching the nozzle tip out for one you use the least. Frequent use causes the nozzle to wear out. Many pressure washer owners have a favorite nozzle tip that they use all the time. Simply change the tip out with one of your other tips if you had the soap injector tip on, the pressure will improve dramatically once it is replaced with the correct nozzle. The soap injector tip is meant to be a low-pressure tip to distribute chemicals, soap, and other materials. Check to make sure that you did not screw on the soap injector tip. New owners might have the wrong nozzle tip on their pressure gun. If you have an air compressor, you can use the air compressor to remove the blockage. Grab a small tool like a toothpick or twist tie wire and dig out the clog. If there is an obstruction, you won’t see the light at the opposite end of the hole. Check for blockage: Remove the nozzle and shine a flashlight through the nozzle tip.However, if no water or very little water is coming out of the tip, there may be an issue. If there is a steady stream of water coming out of the nozzle, move on to the next tip. Test Out Nozzles: Hook up your pressure washer like normal, but don’t start the engine.There are two ways to check if you have a clogged nozzle: Pressure washer nozzles can get blocked fairly quickly. If these don’t match up, it could be the cause of your low pressure. The flow of water from your hose should produce the same amount or more GPM’s as needed for your pressure washer. GPM is the gallons per minute that your pressure washer uses to function correctly. If your water supply flow is lower than the GPM on your pressure washing unit, it could be causing your pressure washer to lose pressure. How We Test, Review and Recommend Pressure Washers.
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