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junk axial wobble plate pump. Usually axial pumps are not worth the time to try to fix them. This one has a 5 year warranty , so they think they have a pretty good one. ( I would never buy one) If you want to try to fix it, I would check the check valves first. Take them out and see if some are broken or not sealing properly. There is a valve kit available.
The other likely problem is your unloader valve. If the seal is shot or the valve stuck open the pump will not build pressure.
parts diagram http://www.ppe-pressure-washer-parts.com/files/1961581/uploaded/axd-PUMP%20BREAKDOWN.pdf
it sounds like the seals in the pump are worn out.if you can purchase a replacement seal & o'ring kit you can do it yourself.get the model number and buy the kit to suit.dis asssemble the pump and replace the o'rings & seals.assemble pump and test.
I have found many comet pumps to be plumbed wrong from the factory. Look on the side of the soap injector and look for the flow arrow, make sure its in the right direction. If it has worked in the past,then take it apart and replace the spring, check ball and seat.
I dont know which comet pump you have, but it is just easier to get a new pump from one of the pressure washer companies on the internet and they sell them on ebay. You can also probably get a better pump that will fit your engine as well. Also, have you tried just changing the oil and not fill it too full? On my 5000 lb washer, if i fill the oil too high when I change the oil, it will foam some. Hope this helps you, Rick