Does the pump need back pressure to activate
Old models yes, new models no
SOURCE: Model CPW 1800 2 lance
Byronj25, you can get the internal part that has most likely failed here. http://www.sparesgiant.com/p-4993-annovi-reverberi-210-gun-valve-kit-with-o-s-2291.aspx. You may want to dismantle it though and check that the black elbow tube has not failed also, as that part is obsolete and so would require a full new Lance. New Lance link http://www.sparesgiant.com/p-5002-champion-cpw-yellow-hl2-annovi-reverberi-gun-large-bayonet-40409.aspx
Your pressure washer is equipped with a "unloader valve". This is the device that routes the water into a by-pass loop when you release the trigger. Something has gone wrong inside causing the valve to not spring into the unload position. You can take it apart and see if you can discover what is going on. The most likely thing is that a bit of water still in it froze this winter and destroyed either replaceable seals or distorted the valve body (which is not repairable). On these little homeowner pressure washers, the best place to get parts is usually through the owners manual that came with it, or Karcher may have a web site set up for this. Also there is the possible resource of a pressure washer distibutor, which you would find in the yellow pages. They usually concentrate on commercial pressure washing equipment, but sometimes getting parts or pumps through them may be easier.
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