Karcher Pressure wash pulsating!

[Blackpool Rocker]

..I have a small Karcher pressure washer that I use to clean the car. It works a treat with plently of pressure, however, as soon as I let go of the trigger the motor instead of stopping, it 'pulsates' at about every second interval.

There is no water leaking from the jet wash or air leaking into the water supply. I have looked to see if there is a inline filter,but carnt see anything. Is it time
for a new pressure washer...?

[Blackpool Rocker]

..I have tried a different lance but it still pulsates. The pressure washer was not over expensive, so i guess if I need a new one it doesnt owe me anything. Untill it finally packs up, I will just keep on turning it off.