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My Karcher gas powered 3100 psi pressure washer has a constant water flow pulsing

\015 I heard that the overboard control valve could be the problem, so I rebuilt it. The piston seemed to move freely on the spring and it all seems to seat properly. Could it be bent or could other factors be causing this problem. When it pulses on, It seems to have plenty of pressure. I can get it to go steady, if i turn the overboard valve way down, but then the pressure is less. FRUSTRATED!\015

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