Re: Water gushes out of the inside of my Karcher jet...
The problem is most likely down to either a broken or damaged plastic inlet pipe, or it could be that the pipe has been dislocated. It is retained by a circlip.
Both problems are due to abuse, rough or improper treatment of the machine.
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Your pump will look similar to the attached picture:
Red circle shows the soap/detergent inlet/venturi.
Blue circle shows cold water inlet.
Purple circle shows your high pressure water outlet
Green circle shows safety valve, dumps water if the pressure inside the pump head is too great or or the water temp too high
DISCONNECT HYDRO OR WITH ENGINE NOT RUNNING DISCONNECT SPARK PLUG THEN RE-LEAVE WATER PRESSURE BEFORE SERVICING the detergent pipe plugs into a pipe on the pump, under which is a spring and ball bearing (stuck open, debris) WEAR YOUR SAFETY GLASSES
You most likely have split the head of the pressure pump. This happens if you use the trigger to stop and start the water flow. My advice is to put a zippy tie around the trigger holding it on all the time and start and stop the machine by the knob on the body.
It is not clear what type of lance or nozzel you have. You said that the machine works fine with the circulating water jet(the turbo). So it seems the machine is fine. I do sometimes service variable nozzels and variable lances. But the best solution is to replace nozzels and variable nozzles and lances with new ones. Regarding the fan spray setting it could have no pressure because it might be in the chemical setting. The chemical setting lets out a fan shape flow of water, but with less pressure. The chemical system only works on low pressure in domestic washers, that is why it needs a low pressure flat spray. The pencil jet has 2 jets comming out because if it is a lance or nozzel with ball bearings, these ball bearings must have stuck in a wrong position. Also 2 jets can come out, due to a damaged nozzel hole.
Altogether, the best advice is to buy a new nozzel or lance...which ever your machine uses. All Karcher machines have their own specific nozzels, lances and high pressure hoses. You cannot change these from one model to another.