Question about Karcher PSI Electric Pressure Washer

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Pump goes on and off continuously with the lance shut. Brief run of the pump every 2 or 3 seconds as if the pressure needs topping up. No leaks visible antwhere.

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Hi , the most common cause's of this fault is a deffective unloader valve or a small peice of dirt or grit caught in the pump valves , unless your quite mechanically competant i would suggest you take it back to your local Karcher service agent as to repair them your self is quite a involved process , if you want to try a repair yourself this link is quite good
http://www.paddockdrayage.com/Karcher/index.htm

Posted on Apr 24, 2010

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Posted on Jan 02, 2017

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What causes my booster pump to increase pressure even after I shut power and or water supply off?


something wrong here. your incoming pressure is 4 psi ( tank pressure to the pump and you use a pump to boost pressure to a maximum of 65 psi at which point the pump is shut off ( all taps close off)
yet with no pumps running the pressure goes up to 100 psi
Find where you are getting pressure in that is making the pump leak
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This truck uses a high pressure fuel system, key must be on for the electric fuel pump, which is in the tank, to work. Fuel pump senses when pressure drops, so that it will shut off if there is full pressure, and engine not running. If there is lower pressure, such as a broken line, it will continue to pump, if the engine is running. If you're asking if it has a safety feature shutting it off in an accident, no it does not, except if the engine shuts off due to the accident, fuel pump will not work, unless key is turned off and then back on, and will then work for about 5 seconds and shut off, unless engine is started. If you're asking why the fuel pump doesn't work after an accident, it's most likely damaged, or a wire has been damaged, OR the computer maybe damaged (therefore telling it to turn on/off when key is on and engine running with key on and pressure is low, or at the right level to run the engine. Again, if you turn the key on and do not start the engine, fuel pump will work briefly for about 5 seconds to bring pressure up to where it can be started, then the fuel pump will work again when the engine is started (so the fuel pump isn't running with the engine off for very long.)

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1 Answer

Karcher 2500ph pressure washer spill valve has been replaced pull wand trigger pressure good for 3 or 4 seconds drops off for a second or 2 goes back to good pressure for 3 or 4 seconds drops off again for...


If you have a Karcher then you should always post your machines barcode.

full article on nozzles :
http://repairshed.blogspot.com/2013/09/pressure-washer-lance-nozzles-what-you.html

The spill valve operates at approx 20% higher than specified pressure washer operating pressure. If you have any lance issues then the pressure could be running higher than specified (machine running at same pressure as spill valve operation pressure)

your machine produces a fixed flowrate of water (maybe 8 litres per minute) and your nozzle is a fixed size. the diameter of the nozzle determines the back pressure. A piece of debris could further close your nozzle orifice and increase the back pressure. Using a new lance that has the wrong nozzle fitted can also cause this issue.

The karcher barcode is on a silver sticker and is usually 15 digits long. Example 156987400000123 is actually model 1.569-874.0 and serial number 00123....

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1 Answer

Have a Karcher kb4040 that continues to run constantly even when the trigger isnt pressed. Also water flows out of the detergant hose when im not pressing the trigger. Pressure seems down slighlty, not...


This is two things. One is the back flow check valve to the soap line is leaking. The other is the pressure switch on the output side of the pump.

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1 Answer

My water pump kicks on every 30 min or so even if there is no water used


When a pump goes on and off there is a water leak somewhere.
There should be a gauge. Let the pump build up pressure and watch the gauge.
The pressure will probably be dropping. This means that water is going somewhere. The leak could be anywhere that you use water, sprinklers, sinks, hose lines. If there is a valve above or near the pump, shut that valve and see if the pressure stops dropping. If the pressure stays up and the pump stops cycling on and off, the leak in in the pressure piping somewhere, you must locate it and repair it.
If the pressure continues to drop even with the discharge valve shut, the water must be leaking back into the well. There is a check valve somewhere on your line between the well and the pump. If this check valve is leaking, pressure will drop and the pump will come on to restore it.

If it is possible to shut off the discharge of the pump, shut that valve and watch the pressure gauge to see if it is dropping.

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Honda 2400 psi before it went out i cold tap the end of the wand on the ground and the pressure would return now when pull the trigger there is no pressure only a fine spray .its a karcher with a honda...


hi,
there is a small ball bearing inside the nozzle on the end of the lance , this can get jammed or missaligned and the nozzle orifice can get blocked , clean this or replace the whole lance with another 200 Bar lance .

hope this helps

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1 Answer

No more then 30 pounds of presure and wont shut off. Flotec water


If the pressure does not get pass 30 psi, then check for leaks along the pipelines and on the tank itself. An air leak on the top portion of the tank can cause the pressure not to trigger the pressure switch. Use soap bubbles to detect any air leak. Although a stuck pressure is not more likely the problem, check it also.

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1991 Explorer fuel pump


so where is the shut off reset for the fuel pump on the 91 explorer? does anyone really know?

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1 Answer

Motor pulsates in rapid sucsession little pressure,with lance removed continuesto run normal,new lance same problem,my estimation is the valve at fault that controls the pressure switch


It could be the pressure switch itself at fault. If it is reading (in error) too much pressure, it will shut off for a second and then pulse as you say.

If the pump seals have gone, you may get this effect too. Depends if the pump is being controlled wrongly, or just malfunctioning itself.

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