oved the unloader valve twice and cleaned it to no avail
2500 PSI Pressure Washer

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I had this same problem on my pressure washer.the pump had some broken parts in it .i found my replacement pump on EBay.

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If there is a leak in any area of the cylinder head, the pressure that stops the machine from running will quickly disperse, causing the motor to restart or pulse. Try to find where the leak is coming from or replace the cylinder head seals. Another cause of the motor pulsing is water starvation.
There could be small leaks, holes, or tears in your garden hose or high-pressure hose that are causing your pressure washer to lose pressure when you pull the trigger. If you find leaks, plug the holes or replace the hose, which should solve your pressure issues.
The simple answer is yes, pressure washers can overheat. This is not unique to pressure washing machines – anything with a motor or power source can overheat in the right (or perhaps, wrong) circumstances.
Here`s how it works, devices from the Home & Garden range can be repaired in our repair centres. Machines within their warranty period are repaired free of charge subject to our Home & Garden terms and conditions.
If the pump is leaking, the cause may be minor and easy to repair. Check the seals, packings, and O-rings for wear. These can easily be replaced, saving you the cost of a new pump. However, major leaks such as the ones caused by cracked or damaged plungers, can lead to pump failures.
The Fuse. If the pressure washer does not start, then the first thing to check is the fuse in the plug. The reading you`re looking for is the same as it would be when connecting the two probes of the multimeter together (as you can see in the example of this video, this fuse is actually fine).
PLEASE NOTE: You should always press the RESET button on the GFCI before using the pressure washer.

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Poor pressure karcher g 2500 pressure washer with a 5.5 honda engine. No high pressure, hose pulsates as does water out of the outlet. have removed the unloader valve twice and cleaned it to no avail
ANSWER : I had this same problem on my pressure washer.the pump had some broken parts in it .i found my replacement pump on EBay.

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I have a pressure washer that sputer when i pull the trigger. The moter sounds fine but i have pressure then nothing and i have pressure. Thank you Stu
ANSWER : How do i unclog the end of my pressure sprayer it works on low pressure but when i put it on high pressure nothing comes no water comes out.

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Soap feed The soap feed hose on my Karcher 2650 does not suck up the soap into the washer. I pulled off the connector piece that the hose is connected to. I can blow through the hose. There is a little metal finger thing that you can tell pushes up into place when the water pressure is high. It seems like it is supposed to drop down and allow some soap through when the water is running. I found a loose(attached to nothing) gasket, looks like a little donut. It was just free floating in there. I’m thinking it may go over the finger mechanism. I just put it back on top of the finger, like a halo and put the screw in piece back in. Anyway, if you know, let me know how all that goes together.
ANSWER : I fixed mine works good too, watch my video step by step i put it on youtubehttp://www.youtube.com/watch?v=UFXSLOBL0Mg

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Honda powwer boss 3000-whenyoupull the handale to spray it kills the engine
ANSWER : Sounds like the unloader (regulator). Try removing the nozzle, the pull the trigger with the engine running. If motor is still running then it could be the Unloader malfunctioning. If you require a new one try a bypass system for the unloader. The bypass will help save the life of the unloader.

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How do i get the unloader valve out of a karcher pump
ANSWER : If you have a black cap on the top of your pump, the unloader is under that. It is called a spill valve and they sometimes can be a real pain to remove. I usually take a drill and drill a 3/32nd hole in the top of the valve, screw a long screw into the hole and use pliers on the screw to pull it out. You may have to try several times before you get it out. If you don’t have a black cap on the top I would need to know the model # of your machine to help.

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Pressure Washer will not reach high Pressure….how do i clean the unloader valve
ANSWER : Nozzle is clogged. Clean out with small diameter wire.

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My Honda pressure washer is leaking out of the thermal relief valve and I am looking for a part,I also do not have the manual. The model number is WGC 3030 and it is 3.0 gpm 9.0HP. The number on the thermal valve is 33120004,where can I find a part?
ANSWER : Does the thermal valve just screw into the pump head, if so what size thread is it? I have 1/4, 3/8, 1/2 in stock.

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I hook everything up turn the water on and it works for a few seconds. if i pul the trigger again it will not come up to pressure until i shut the engine off and start it back up
ANSWER : You have a problem with the unloader valve,

See this link to fix the problem

You may also need to replace the unloader valve, see this link to purchase a revised unloader valve

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