Question about Karcher 2500 PSI Pressure Washer

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I squeeze the trigger, I have pressure for 2-3 seconds and the engine dies.

I have removed the piston and spread white lithium grease all over it and put back together and that did not work. I am connected to a garden house and assume that I have a high enough volume of water running through the system. The pressure washer is about 8 months old and the previous owner used it one time about 6 month ago. I started it up 3 days ago and used it for about 20 minutes. The pressure was intermittent then at first but then was constant and was running fine. I ran out of gas. I put new gas into it a couple days later and have had this problem every since. I used regular gas instead of premium....could be part of the problem.

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Your pump is probably cavatating. when you first hook it up and turn hose on open thr trigger and let water run thru until it quits spitting and flows smooth. then crank it up and see if this gets it done. if not you could have a problem with the pressure valve bolted on the outside of pump. there should be a nut shaped stem to adjust pressure . turn it in and see what happens.

Posted on Apr 21, 2009

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Posted on Jan 02, 2017

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I have the same problem. This is the responce for Karcher......

The unloader valve may be sticking, or is dirty. It probably needs to be cleaned and may need to be replaced, it is inexpensive. It gets a lot of use, but extends the life of the pump. The function of the unloader is to allow the machine to run in a bypass mode while the trigger of the gun is closed. First, a lack of high pressure can be caused by: 1. Insufficient water feeding to the unit, so check that the water is turned on all the way and that there are no kinks in the hose. 2. The inlet filter may be clogged. (it will need to be removed and thoroughly cleaned). 3. An internal water leak. 4.Also, low pressure can be caused by worn spray tips. If you have checked the first three with no resolution, the problem is internal and could be as simple as a sticking unloader valve. If you are mechanically inclined, you can clean this valve yourself and greasing the o-rings (use lithium based grease), or take it to a local service center. You do not need to take the pump apar
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Note: Lithium based grease will prevent future failure of the unloader valve.

Also, check websites such as fixya.com for tips and how-to info particularly on cleaning the unloader valve. Be sure to use lithium grease if you reassemble it.
I am going to check the manuel to see where it's at

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