I have a karcher 1600k/k330m electric pressure washer...it sprays good, but when I release the trigger on the spray want the motor continues to run...I'm not seeing any leaks...

This is normal. The high-pressure car washer has certain dangers. If the water column of his spray gun is aimed at people, it will stab people. If the switch is turned on and spray water, then the pressure of the spray gun head will be sprayed around, which will accidentally hurt people. people, so it's designed this way.

Are you talking about the electric switch that shuts off the motor when the trigger is released?
If so, there is an arm that comes out of the high pressure side of the manifold and is connected to a spring loaded piston. The piston extends under high pressure (spray trigger released) and retracts when spraying. At the opposite end of the arm is an allen screw and locknut. The allen screw bears on the microswitch arm to control the electric motor. When properly adjusted, the motor should turn off when the trigger is released. If it doesn't, loosen the locknut and adjust the allen screw slightly outwards toward the switch. Pull the trigger a few times and verify the motor starts up and shuts down when you release it. Tighten locknut.
Hope that helps.

Dear Peggy,
You can have a problem with the valve at the gun which is sticking open. This valve can be OK without pressure, but with pressure it can stick open. It is very easy to make sure, by attaching a good gun or a new gun. In simple words...replace the gun.
Regards,
Fulltech.

this Karcher unit have a termal overload in the motor but your problem can be cause by a pressure switch the shutt on and off the motor when you stop spraying.

The motor doesn't pulsate when you are spraying and pulsattes when not spraying is normal otherwise the pressure will just keep building and burn out the pump. However, if you are not using the sprayer right away then the unit should be shut off until your ready to start again.
I hope the answer is helpful, please rate if the answer has helped in any way. Good Luck and have a great weekend.

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 ,

You can get a new trigger gun from here:

link

It sounds like the valve in your trigger gun is sticking. Depending
on the model it can be rebuilt or repaired

It sems you have a blockage in the tip. If you get a grain of sand in the nozzle it will act like this. Get a piece of fine wire and poke down the nozzle to free it up.

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.