Question about Karcher K 3.98 M Electric Pressure Washer

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When the trigger is released, the water stops, but the pump keeps running.

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It must be leaking somewhere

Posted on Jul 23, 2009

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Posted on Jan 02, 2017

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2 Answers

Husky 1800 Pressure Washer motor will not turn off when wand trigger is released


I think you have one of two things going on hear, an overpressure problem or a carburetor issue with the engine.

Jul 25, 2017 | Husky Garden

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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

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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...


When water is running through system, the motor has to run to keep the pressure built up. So, if the water is leaking out, the motor think it needs to keep running to keep the pressure built up. The leak needs to be fixed to the motor will not run constantly.

Jun 16, 2014 | Karcher PSI Electric Pressure Washer

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My electric Karcher pressure washer does not shut off.


this can be that you need to bleed the system of air or that there is a problem with your trigger gun sticking when you release the trigger.
These are two things I would check before you go into the machine.

May 14, 2012 | Karcher Garden

1 Answer

Won't stay running


Pressure washer when you first try to start them that stop underload. We had the same type of problem with 11 hp Honda if you hold the trigger open the motor will be under less load we found by running the motor for about a minute it would work normally. Remember to make sure the water hose is turned on pull the trigger on, until water is coming out of the wand , now try and start the motor but also hold the trigger open, now you will not be building maximum pressure, after about a minute release the trigger and see if it keeps running.

Feb 19, 2011 | Briggs & Stratton 2200 PSI Gas Pressure...

1 Answer

When trigger is pulled pressure goes up and down as long as trigger is held


When you start the pressure washer, having the water from the faucet at full pressure, apply pressure to the triger gently....this should allow the system to release the pressure gradually and keep up.....when you pull the trigger full throttle, it can cause the jurking sensation in system. If this does not resolve the problem you may have a bad empeller pump and requires replacement. Do not allow the pressure washer to run for more than a couple of minutes without water flowing thru is as this will burn up the motor )empeller pump). Good luck

Feb 11, 2011 | Garden

1 Answer

Too much pressure.


You need to keep the trigger pulled every time you start and you need to run the water for 3-5 minutes wide open before you start. Zero air should be in the line or this could cause it to **** out. You probably damaged the pump at this point.

Apr 27, 2010 | Dewalt DPH3100 Gas Pressure Washer

1 Answer

My 1750 psi campbell hausfeld pressure washer will operate at first until I release the trigger on the wand. Then it won't restart. If I wait for a while it will run again. Sounds like the pressure switch.


Common with that washer...it has a wabble pump. Release the trigger, if by pass does not engage, stalls engine. You can however keep using it, all you have to do is keep trigger pressed, and when you are cranking engine, depress trigger with the free hand. Can be repaired, but the fix probably will cost more than a new pump.

Oct 18, 2009 | Garden

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 Garden

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