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020209 pressure washer has no pressure

Has no pressure unless trigger is released then it will build up a little . i just replaced the unloader valve and got same result. i have the monifold off and there is nothing wrong with any of the seals and valves. looks like new inside . this washer has only 10 hours run time on it ,

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  • randell howell Mar 25, 2012

    Hose assy. not stopped up , all valves are clean and working . when engine is running without the hose attached it still dosent have high pressure. The engine will stall when handle isnt depressed now. It hasnt been doing that . this is a new property of the problem. What to look for next ? It still has me baffled .Thanx guys

  • Don Fuller
    Don Fuller Mar 25, 2012

    The engine stalling when the trigger is released is 100%, definitely as unloader issue. If you've just replaced the unloader and the engine stalls when you release the trigger; either the new unloader is screwed down too far for your pressure washer or the unloader is not installed properly. Screwing the unloader counter clock-wise (less pressure on the spring) is how to back off on the pressure setting.

    Nobody has thought of it yet, but with the manifold off, pull the crank cord and be sure all pistons are moving. It is possible that one of the pistons has become unattached from the "wobble-plate", or cam -- which ever it has.

    Other than that--there is nothing else. Just so you understand, the only way to actually have pressure is for the proper amount of water to be forced through the pressure nozzle. So - right out of the pump, you wont have pressure. But you should have "flow". Certainly you would look at it (with the hose off) and even if it was working right you may think "I can **** harder than that". That's because you only have flow -- not pressure.

    So long as the new unloader is causing the engine to stall -- and us not knowing why this is occurring -- there is no need to test further. That bit has to be understood and fixed.

    I had assumed that your washer had one of those unloaders that the body is molded into the manifold head of the pump. Apparently it uses a completely separate unloader??? At this point I'm a little worried that you've installed it backwards. I've seen a lot of people do that. This is why it is urgent that we understand exactly what is happening with the unloader before doing anything else.

    Hopefully you can work on it tomorrow, and we can communicate until we find it. It has to be one of the things I've brought up -- there is nothing else. Oh, one more, and this one is way out there - but its possible for the engine shaft to be spinning inside the hollow shaft of the pump. This can happen if the set screw becomes loose and the "key-way" falls out. Oh, but that couldn't be the case because your engine wouldn't bog down and die when you release the trigger.



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  • 97 Answers

Your water inlet may be stopped up. Whether this model only has a screened hose washer or a better filter, pay special attention to that. Be sure the pathway is free and clear.

Take each of poppet valves and while pushing (with a pencil or something) on the part that moves up and the spring pushes it back down - with magnification and lots of light, be sure there isn't a small piece of debris affecting one of those valves. Its easy to miss, so look very closely.

Next, remove the hose from the pump. We are by-passing the entire unit that includes pressure hose, trigger gun, lance, spray nozzle. If it seems to pump a lot of water out of the pump--then the problem is most likely the trigger gun is clogged or the pressure nozzle is clogged. Some trigger guns can be taken apart -- some, not so much. Same with nozzles.

I hope this helps you, Randell. If yes, please take a sec to rate me. Thanks!

Posted on Mar 24, 2012


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Posted on Jan 02, 2017

  • 10 Answers

SOURCE: 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.

Posted on Apr 20, 2009

  • 384 Answers

SOURCE: I have a Generac pressure washer, model #01450-0,

Take a small diameter wire and poke thru the discharge hole of the spray head to clean out.
Second time in 6 months that I had the same problem. The problem is alway in the spray head.

Posted on Jul 24, 2009

  • 40 Answers

SOURCE: where is the unloader valve on my pressure washer

is not necessarily a cap, but could be a screw in plug, that should be close to the hose hook-up on the pump Inside there there should be a round ball and a spring that you can tighten or loosen to adjust the unloader and if it has been used ALOT, where the ball seats there could be grooves cut in there and you might need to get a valve kit to fix it

Posted on Sep 05, 2009

  • 6 Answers

SOURCE: Karcher G3050OH Pressure Washer Spill / Unloader Valve (Bypass)

You should put 'locktite' on the male thread and screw it in all the way and lock it there. That is how it works ,the spring keeps the valve at the bottom closed during high pressure operation. When the gun is released the part with the o-ring is forced down resulting in the valve opening and then the pressure is by-passed.Those dont normally give trouble. Look for a blocked nozzle or a restriction somewhere in your high pressure hose.

Posted on Sep 08, 2009

  • 1 Answer

SOURCE: Unloader Valve - Karcher Pressure Washer

where is the unloader valve locaed on a Briggs Stratton pressure washer?

Posted on Oct 03, 2009

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Want to know what the black Knob, I think called unloader valve is used

Hubert, The unloader valve is like a by pass for the water and regulates/controls water pressure and redirects water when gun trigger is released. Check the attached links,instruction and guides to learn more about Pumps/unloader, Good luck
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sounds like a faulty unloader valve i would not recommend using it unless problem make sure unloader is not overtightened

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My Honda pressure washer wil not run when the wand trigger is released. It builds pressure and cuts off. What will cause this?

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The unloader on yoru pump is bad.. Pressure washer parts catalog quick links Pressure Washers High Pressure... go here with your model number on your pump and they can guide you to your new unloader. Good luck

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There is a valve on the water pump called an unloader valve, when this valve sticks open it will not allow the pressure to build. This valve is designed to recirculate the water when you release the trigger so you don't damage the pump. Go to jackssmall engine and type in the model # of your unit and it will give you a parts breakdown so you can see where the unloader vale is located or if you have the manual for your unit look in that. Remove and clean. If this doesn't work you may have to replace it.

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Lost pressure let handle go spits out 1 second of pressure then no pressure

What you are describing is an unloader valve failure. The unloader valve (also called a spill valve or safety pressure relief valve) is sticking in what is known as bypass. Your pump is able to build pressure but when the trigger is squeezed, rather than directing the flow up to the nozzle it is looping the pressure back through the pump as it does when you release the trigger. Depending on the specific brand and model you will need to either replace the unloader or lubricate it if it is a Karcher with a spill valve. If it is a Karcher there is a known issue with the following models:


All of these have an issue where the spill valve sticks and will need to be lubricated with Vaseline or lithium grease. You can view a guide for this process at Select Maintenance/Karcher/Pressure Washers/All/Spill valve lubrication.

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Not sprayer engine stop

This is an indication that the unloader not working properly. When you release the trigger the unloader senses the increase in pressure and bypasses the water into the water inlet. When the unloader is not working and you release the trigger, the water pressure builds quickly and overcomes the power of the engine shutting it down. Here is the manual for your machine,

and some information about troubleshooting from the manual.
"Not Unloading. Leak in Gunvalve or Hose. Repair gun leak . Replace leaking or broken hoses. Debris or wear in Check Valve. Remove Check Valve parts and clean. Check O-Ring. Reface with emery cloth, or replace checkvalve. Damaged Piston U-Cup. Rebuild Unloader Valve (Service Center)."
Usually when the unloader fails the pressure regulator will most likely need to be replaced as the unloader is usually incorporated within. For now try lowering the pressure some and just tie the trigger open untill you can service. Good luck.

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NO PRessure

Hi It sounds to me like your unloader valve is stuck, this is the thing that is meant to move up and down when pressing the trigger.Please remove the unloader valve assembly and check for damage. If no damage is found then grease and lubricate this part and replace and this should work ok again.

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No pressure unless i take the nosle off , pull trigger and put nossel back on then it's ok until i release the trigger again ?

unloader valve sticking in the pump head. remove unloader valve/ pressure reducing valve as per parts manual.

It will probably be caked up in white crystal type deposits if its an aluminium pump head. clean off the deposits and inspect the 'o' rings. if 'o' rings ok , apply silicon grease and refit.

It could also be a partially blocked lance jet not allowing enough water to come out of the lance if it is a flow sensitive unloader valve.

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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.

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