Question about Powerboss 20309 3,000 PSI 2.5 GPM Gas Pressure Washer

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Power boss pressure washer stops when trigger is released

Runs but stops when trigger is released an it builds pressure then cuts off

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The unloader on yoru pump is bad.. Pressure washer parts catalog quick links Pressure Washers High Pressure... go here with your model number on your pump and they can guide you to your new unloader. Good luck

Posted on Feb 22, 2015

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My Karcher 530M runs ok until I release the trigger, then it will not start again unless I switch and allow the water to run through for about 15 secs before switching on again


Hi Cliff:
My experience is that the pump pressures prevent the engine from starting, so we hold the trigger while starting.
My brother has cut a wedge of wood that he uses to jam the trigger open to bypass the problem. It can get a bit wild if the wand is not secured when the unit is started..

Aug 10, 2016 | Karcher Garden

1 Answer

Why is pressure not building up to cut off?


The pressure switch that shuts off the motor when you release the trigger may need to be replaced if you're sure that there is sufficient operating pressure.

May 21, 2015 | Electric Garden

1 Answer

I switch the pressure washer on motor starts pressure builds up motor stops. OK pull the trigger on the lance the moter starts sounds different water pressure low. Release trigger motor still runs.


It isnt very clear your explanation of the problem but what type washer do you have first? It sounds like you have a bad unloader or need a new variable nozzle tip. Can you explain in more clear detail. Thanks

Feb 16, 2015 | Garden

1 Answer

I have a gasoline pressure washer. i connect machine the right way. try to start but machine only runs when trigger is pressed. stop pressing trigger machine shuts off. the water is flowing through the...


Not knowing exactly what type of pressure washer you have, most are equipped with an "unloader valve" so the pressure bypasses. If this is malfunctioning, the pressure will build up and bog the engine down.

Feb 11, 2011 | Garden

1 Answer

When I release the tigger the pressure washer stops running. Runs fine as long as trigger is depressed. What could cause this?


When the trigger is pushed, the engine is supposed to rev up to increase the pressure. So from the description, is sounds like the idle speed is simply set to low and it dies. So just set the idle speed higher. You could set it as high as pulling the trigger does if you want, but that would waste gas.

Sep 04, 2010 | Briggs & Stratton Power Products 1539...

1 Answer

Not sprayer engine stop


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.

Jul 14, 2010 | Simpson WS4050V Water Shotgun 4000 Psi...

1 Answer

Loud repeating noise until the water trigger is pressed


Check the pressure washer for leaks. That sound is probably the unloader valve recycling as the machine slowly looses pressure and needs to build it up again to max pressure.

Dec 15, 2009 | Garden

1 Answer

Gun wil not trigger after stopping


I'm not real clear on what you're saying, but I think it's that the trigger will not shut down the pressure as it should. It stays stuck on. The other info is how long you've had the washer, but my hunch is that maybe you have hard water, and the deposit build up may be getting the trigger stuck. Try spaying some penetrating oil inside the wand to loosen any deposits that may have built up.

Aug 11, 2009 | Karcher PSI Electric Pressure Washer

1 Answer

Trigger problems


It is recommended that once pressure washer is in operation and water flow thru wand is there ,that you do not allow off period between burst of no more that 2 minutes or you highly risk damage to your pump,not engine, due to overheating. See if Dump valve is adjustable,cheaper models not adjustable. This valve senses pressure/heat build up in pump when trigger is released, and is a secondery backup to release such heat/pressure to avoid pump failure. If you have repeatly left trigger off for more than 2 minutes in for prolonged periods of time,this is not good.

Thanks and Please Rate a Fix Ya
John jj505

Apr 13, 2009 | Karcher Garden

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