Question about Karcher 2500 PSI Pressure Washer

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Karcher KB 499

My karcher is making a continuous pulsing pump noise, when you have stopped hosing. We seem to think it is the pump playing up.

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  • Anonymous Mar 11, 2008

    I have a Kharcher 360 high pressure washer, which surges when in standby mode, there is no sign of an external leak, I suspect a faulty valve, I have stripped the valve body but cannot find a fault, please help.

  • Anonymous Mar 15, 2009

    my pump also pulsing and i have lost pressure

  • Anonymous Mar 30, 2014

    Making a strange noise and leaking at bottom

    Making a strange noise and water coming from bottom

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A high pressure had a pressure relaese valve may be the problem.

Posted on May 25, 2008

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Hi the pump surges when there is a leak on it find the leak that should sort your prob.
Hope this helps. Sean

Posted on Mar 04, 2008

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1 Answer

How do i stop it from pulsing?


Getting to much air to carb probably.

Jul 11, 2015 | Karcher Pressure Washers

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The "manifold" as talked about above is also called the "Control head".
For a picture of the very small cracks in the control head see here: Karcher Control Head cracks

The video linked to below talks about the cracks in the control head at 7:00 through to 7:08. They guy incorrectly calls it the cylinder head in the video. How to FIX Karcher pressure washer

If Karcher made the control head from an aluminium casting, or used a metal insert near the point of failure, their product range would be a LOT more reliable.

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What is this problem - Karcher 3.86 electric pressure washer: humming noise, plug gets very hot, then unit shuts down?


Your pressure washer is either not fitted with a run/stop device in which case like mine you have to switch off within a few seconds of closing the trigger. Check your model features?
The humming noise is the motor stalled out against the pump because there is nowhere for the water to go. The shutoff is caused by the safety overload switching off after overheat.
Or, it has a pressure operated run/stop which is not working. Because water and electricity don't mix, I would suggest getting more specific help. You can download Karcher manuals /spares lists online from Karcher specialists but remember electricity is the silent killer.

May 20, 2014 | Karcher Pressure Washers

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My washer makes a loud pulsing noise when not being used,as soon as I pull the trigger it works fine.


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Oct 14, 2012 | Karcher Pressure Washers

2 Answers

My karcher seems to pulse when on, could this be due to the low water pressure from the hose?


I do not have specific experience of your machine.
However, the high pressure pump will be controlled by a pressure switch on the high pressure outlet to the pipe and jet.
Pulsing (turning off) suggests that the outlet (high pressure) pipe is blocked or partially blocked. Try checking the nozzle and (with the unit turned off) clearing it with a fine piece of wire.
Hope this works
Nic Williamson

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My Karcher 2.99 starts and stops, (pulses) when th...


Is liquid leaking from the base, when the Pressure washer is on ?
I have the same Problem, the leak is from the seam of the Manifold housing. There is a small crack in the seam. A manufacturing defect.. A New Manifold Complete Replacement is $61.03, about the half the price what I paid for this pressure washer at Walmart... :( If under 1 year old, and you can find a receipt,Karcher will replace the whole Pressure washer under warranty.

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I have a Karcher KB5050 it started to pulse when the trigger stopped


Is there water leaking from the bottom ? If so, then you have a leak in the pump. Bad seal or crack in the Pump.
If under 1 year old and have a receipt, Call Karcher for a warranty replacement.

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2 Answers

My Karcher pulses when on standby,stops when i use the trigger,but it also seems to have lost pressure.Is less than 6 months old but have lost receipt!


Is there a leak from the bottom ?
If so Problem, the leak is from the seam of the Manifold housing. There is a small crack in the seam. A design weakness.. A New Manifold Complete Replacement approx. $61.03.
If not you may replace the Pump Manifold Housing from Karcher, or locate a local Karcher Service Center.
If under 1 year old, and you can find a receipt,Karcher will replace the entire Pressure Washer under warranty.

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You did winterize the machine? Leaving water in a powerwasher will freeze and damage the pump. It's a common happening, because people don't think of it or are not told by the maker.

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Karcher k7.80 pressure washr


I have a Karcher K 3.86 M electric PW with a similar problem: water leaks from the pump near the outlet and the pressure surges on and off continuously at intervals of 1-2 seconds. The leak appears to be coming from a very thin crack in the plastic pump head in what I think is the "unloader" valve portion. I read elsewhere that if you leave water in these PW's and it freezes it will crack, causing leaks. I don't know how you can empty all the water out so I think we must store these PW's in areas that won't freeze in winter.

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