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whats wrong with my pressure washer?

my karcher k380 has water coming out back of actual machine and it make a pulsating sound when i use the longest lance i have made sure its not blocked can anyone help
sandra, April 2009
It sounds like a crack in the power head - thats the bit that actually does the pumping, and its coupled directly to the electric motor. If its a cheaper machine, the power head is plastic and prone to failure.

John, April 2009
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