Well, I looked up articles on how to repair a Karcher power washer, and it looks like it is not worth it. They a POS, and even if you replace bad parts the problem returns within a year - many types of problems on top of it all.
I am convinced that my problem is because the solvent or sealant (if any) used on the force-fit slippery plastic parts at the inlet and discharge area is of
bad design. I have no idea how one would change this to an all brass design, it is a total re-engineering proposition.
The "Seal-All" I used did not stick, I was able to peal it off by hand and with a flat screw driver.
I identified three suspect connections which I feel are prone to failure.
I switched to a 2-part plastic epoxy to seal these joints from the outside - which at best could buy me another year or at worst a single hour of use prior to failure.
If you need to use a power washer every year and not just for one summer, I suggest you purchase something "professional grade", this consumer grade from China via a Canadian company stuff is pure crap. Just Google "Karcher Repair" if you have any doubts. And I heard from someone on-line that they don't treat their workers any better than their customers.