Several things, first is the soap injection on the low pressure side ** upstream injector ( near the garden hose side) or on the high pressure side **down stream injector ( by the pressure hose)
The issue with either is that if they are not cleaned out after each use, they will often clog. Plus on the injector on the low pressure side, you are never to use any caustic cleaner and never anything like acid or bleach, since this also sends that chemical though your pump *another story)
If this is a screw on type injector or a snap on type, it is normally easier to replace them, they should cost less than 40 dollars for a good one.
The trouble is that many of the home quality models have the soap injector buit into the pump head and they can not be replaced with out replacing the entire head.
There is normally some valve that allows you to open and close the connection if this is a low pressue side injector, since it can not stay open all the time or it will damage the pump over time. Check so see that that valve is actually moving or working.
But to be honest this is one of the often replaced items on pressure washers. On commercial machines used everyday, they get replaced about every 6 months to 1 year.
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