Question about Simpson WS4050V Water Shotgun 4000 Psi Cold Water Electric Start Gas Powered Pressure Washer W/ Vanguard Engine

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Not sprayer engine stop

My pressure washer turns off when i stop spraying

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  • Simpson Master
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This is an indication that the unloader not working properly. When you release the trigger the unloader senses the increase in pressure and bypasses the water into the water inlet. When the unloader is not working and you release the trigger, the water pressure builds quickly and overcomes the power of the engine shutting it down. Here is the manual for your machine, http://www.pressurewashersdirect.com/manuals/Simpson_WaterBlaster%20manual_2.pdf

and some information about troubleshooting from the manual.
"Not Unloading. Leak in Gunvalve or Hose. Repair gun leak . Replace leaking or broken hoses. Debris or wear in Check Valve. Remove Check Valve parts and clean. Check O-Ring. Reface with emery cloth, or replace checkvalve. Damaged Piston U-Cup. Rebuild Unloader Valve (Service Center)."
Usually when the unloader fails the pressure regulator will most likely need to be replaced as the unloader is usually incorporated within. For now try lowering the pressure some and just tie the trigger open untill you can service. Good luck.

Posted on Jul 17, 2010

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The engine cuts off when i squeeze the handle on the sprayer, what is causing this to happen?


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Thanks Kf1013 and please vote me a Fix Ya!!!

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