Question about Karcher 2500 PSI Pressure Washer

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When squeeze trigger to start spraying my pressure washer stops running

When i start to spray and squeeze the trigger pressure washer stops running

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  • Anonymous Apr 05, 2009

    my pressure washer is not creating pressure????

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6 Suggested Answers

jmgldsmth
  • 1869 Answers

SOURCE: new Karcher pressure washer won't start

replace the fuel carburetor filter and, or, your fuel tank filter

Posted on Aug 31, 2009

stug_57u
  • 99 Answers

SOURCE: No pressure in the pressure washer

Leaving the hose on shouldn't cause a problem so don't panic. It sounds like you could just have a dirty nozzle. Try sticking a pin or something in the end of the nozzle (machine not running) and giving it a clear out. also if it is a two peice gun, split it and tap the squirting part on something clean like a workbench to clear any debris that might have got in there.

Posted on Nov 01, 2008

  • 18 Answers

SOURCE: cleaning solution isn't siphoning to washer wand

you need to use i believe the black tip where there in least pressure it does not work with pressure

Posted on Jun 27, 2009

  • 174 Answers

SOURCE: I have a K3 78M electric unit . The motor pulsates

This sounds like an internal leak. If you are handy enough here is a schematic. On B@ it could be #25 is sticking or the valve inside #8 is leaking or the water seals #18 need replacing or #1 is leaking

Posted on Aug 18, 2009

  • 251 Answers

SOURCE: We have a Karcher G2500VH pressure washer. If you

Hi, Karcher calls the unloader valve a spill valve,
this is a link to a full drawing/parts listing , and your fault description might well be a sticking /seized unloader(spill ) valve hope this helps
http://www.pressureparts.com/ManualViewPage.aspx?Manual=/mmDEV/PDF/karcherparts/g2500vh.pdf

the part number is on page 9 of the drawing
spill valve 45910400
hope this helps , we usually use some good quality silicone grease to lube the valve ,

Posted on Mar 08, 2010

  • 1378 Answers

SOURCE: pressure washer does not spray consistent flow of pressure

Pressure washers have a pressure regulator/unloader that bypasses the water back into the intake when you let go of the trigger with motor running. If you let the machine run for long preiods in bypass the system could be damaged due to heating of the water being bypassed. The water is in a closed loop. The as the unloader wears it will tend to want to bypass which is what is happening in your case. Dirt trapped at the tip will cause this also. Install clean tip to solve problem. If clean tip did not help then try lowering the pressure by turning pressure regulator counterclock wise. If problem is gone then parts are failing but keep using pump. Good luck.

Posted on Jul 11, 2010

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1 Answer

My electric GPW 1600 doesn't stop running when I let off the trigger?


Mostly they don't.
In order to ensure there is no delay in building up pressure for the next spray requirement and to lighten and cheapen the design, the motor is kept running to keep maximum pressure in the line and surplus pressure is recirculated through the pump after being ejected through the unloader or regulator valve.

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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 engine cuts off when i squeeze the handle on the sprayer, what is causing this to happen?


Sounds like a bad unloader valve. Do a search on "pressure washer unloader valve symptoms". When they are faulty there will either be little pressure or it will stop an engine abruptly. The engine will not just die down as it you were turning it off. It would stop cold.

May 28, 2015 | Homelite Pressure Washer. 2700 psi 2.3 GPM...

1 Answer

Why does my pressure surge


Common problem across brands. When you spray water the drop in pressure triggers the motor to take the hose pressure ~ 30 psi and boost it to ~ 3000 psi. Water coats these parts with calcium (hard water) or other junk and water contains bacteria which causes slime and scale. Once that pressure switch / valve is sufficiently clogged it doesn't move smoothly so it can fluctuate between sending a yes / no signal about whether you are squeezing the trigger or not. This causes the pulsing.

EZ test: take the the tip off the wand, start the unit, squeeze trigger - should run continously with no problem. If it does for sure you need to watch a video on dissembling and cleaning the valve body. It is not hard but you must work carefully to avoid losing parts especially springs and take digital pictures to record the order for reassembly.

Jun 04, 2014 | Dewalt DPD3100 Gas Pressure Washer

1 Answer

When the washer is not spraying, the motor cycles on and off. Eventually the motor overheats and shuts down.


You shouldn't let the washer run for more then 30 seconds without spraying. If you let the motor run without squeezing the trigger, the pump will overheat and damage the motor. You may also need to change the spark plug and clean/replace the air filter.

Jun 06, 2011 | Karcher Pressure Washers

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I bought a honda pressure washer power boss 3000. I load the gasoline, start the machine, but pressure water is not coming out from the trigger. i tried so many things , but can t get started.


If you are using a water tank for water supply, remove the water supply line from the pressure washer and connect a water hose from a faucet. Turn the water on, then crank the engine. Pull the trigger of the spray gun until water comes out. When then water starts to spray properly the release the trigger, shut engine down with pressure on the line then reconnect the water supply from the tank to the pressure washer. If this fixes the problem then the problem was "air-locked"! Happens alot with new pressure washers that have never been run. If you need any other help, please email me @ davidandlisacampbell@yahoo.com

Feb 18, 2011 | Honda Pressure Washer PSI 3000

1 Answer

Washer has low pressure. but can see pressure build up in hose. then when squeez triger motor stops.


Hello, W/D here.

Sounds like it may be air locked. Connect the hose to the washer. Connect the wand and hose to the washer. Open the supply water, and hold down the trigger on the spray wand. Be patient, this can take several minutes.
Now crank the washer.
Best regards, --W/D--

Feb 01, 2011 | Briggs & Stratton 2200 PSI Gas Pressure...

1 Answer

Engine runs great, when i turn the hose on it dies.if i hold the trigger and start engine it runs, as soon as i release trigger the engine dies


Make sure thre is no air lock in the system line. So first of all use a clean line to wash off and blow out any dirt in the spray gun.
make sure the engine is having good fuel and power it on to run and warm up . let it run over without any load on it . Now turn the hose on it and power it on slowing, do not stop but keep it running to power spray . The accumulated dirt might come off and make the run smooth after some time.

Sep 18, 2010 | Karcher 2500 PSI Pressure Washer

2 Answers

Karcher K 3.68 M operation


These units have pressure valves that automatically turn off the pump once the pressure is high enough. The pressure switches do fail and sometimes stick and act as you've described.

May 07, 2009 | Alfred Karcher K 5.93 M Electric Pressure...

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