Question about Karcher 2500 PSI Pressure Washer

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Pressure fails to engage

When I turn the washer on, it engages properly, but once I let go of the trigger, it will not re-engage. Water continues to come out, but with no pressure.

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  • 33 Answers

Is this an a/c washer? if so sounds like press. sensor is screwing up.

Posted on Apr 21, 2009

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1 Answer

Pressure washer has no pressure at all


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this is the same as letting the trigger go and the pressure relief regulator is not engaging the pump to produce pressure
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Why does the motor run when I do not pull the trigger of the gun after the high pressure washer is turned on? The motor is supposed to run only if the trigger of the gun is pulled and shuts off when the...


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Not sure I understand. What is your model #.
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The trigger on the wand of my Karcher model K 368 M will not re-engage for several minutes after the trigger is released. If I repeatedly squeeze the trigger for a few minutes, eventually the switch will...


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Aug 10, 2013 | Karcher K3.68MR Electric Pressure Washer

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I have a Karcher G2500HT. When I pull the trigger the pump will not engage. I pulled the pump off, checked the seals, and cleaned the screen. When I put it back on there was no leakage but the pump...


I would have to agree with your service department. The unloader valve works like this, When you press the trigger it closes and allows the water to build pressure through the pump. When you let off the trigger the valve opens and by-passes the water through the pump so you don't damge the pump. If this valve is sticking and remaining open the pressure will not build. You can remove this valve and clean relubricate with white lithium grease just a coating and this should clear up your problem. Check the port that the valve sits in and if you see gunk just clean with carburetor cleaner and blow it out with air compressor. A new unloader valve can cost between $40.00 - $60.00. Try to clean first before you buy a new one. The valve is usually located near the outlet that you connect your pressure hose to. If you can't find it go to jackssmallenginerepair.com and do a parts look up for your machine and you will see where this valve is located. Hope this helps.

Jul 20, 2011 | Karcher 2500 PSI Pressure Washer

1 Answer

Engine will not start when the water is on. You can start the engine and then turn the water on but it will kill the engine. I have tried to clean the unloader valve.


To isolate whether or not the unloader valve is still stuck or sticking, try starting the unit with the wan trigger engaged water coming out to spray. If the unit runs while wan trigger is engaged and shut down when released your unloader valve isn't working. Hope this helps God Bless

Sep 18, 2009 | Pressure Washers

1 Answer

Troybilt pressure washer won't run


If you ran the pressure washer without water running through it on startup you probably got your pump.You are supposed to engage the trigger on start up with water running through it so as to release the pressure off the pump so it will start easier. Hope this might help you.

Sep 15, 2009 | Briggs & Stratton Prosumer 20324 Gas...

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check spark & spark plug.if you have water on trigger must be engaged as you are turning pump also creating pressure this stops engine turning fast enough even if you pull rope hard as you like engine does not operate run cycle properly.

Apr 19, 2009 | Pressure Washers

1 Answer

Pressure washer stalls out when wand nozzle is released


common for not starting unless trigger engaged as you are turning the pump as well as engine creating pressure,as for stalling pump has unloader valve which is probably in need of grease(use good silicone grease)this allows water to ciculate when trigger released.

Apr 19, 2009 | Campbell Hausfeld Pressure Washers

1 Answer

When trigger is engaged under pressure nothing happens.


Make sure all of the water is bleed out of it buy holding trigger down with motor not running until theres is not more bubbles or air that comes out..Make sure where the inlet for waters screen is not plugged..You may have to back flush washer to clean out or to unstick the pressure valve..Hope this helps you and have a great day

Apr 06, 2009 | Pressure Washers

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