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Really need more information...It sounds like they didn't give you a complete gasket kit...You will have to remove and re-install other components just to be able to see the crank shaft....You need the front and rear oil seal for the crank..,Oil pan gasket..,exhaust will have to be removed also...etc.......NEED MORE INFO..
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
If the Comet Pressure Pump Oil is some kind of a Synthetic Oil that supposed to be extra effecient than an ordinary oil, then that will cost extra. If that is ordinary multi grade engine oil (SAE 20 - 40), then, you can buy over the counter. Most synthetic oil have additive that give extra longer life to all moving parts.
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 did an engine swap because of a rod knock and when I removed the power steering pump the seal was upset and would not seal again. I found a guy on the internet who had a kit for under $75 shipping included (sorry can't remember sight name). This kit comes with a new improved two lip seal, couple o-rings, gasket, home made tools, and a video showing how to install the new seals. I installed the kit and it fixed the leak in about 3 hours. The dodge dealer wants $1100.00 for a rebuilt vacumme pump. Do a google for power steering leak.This is a very common problem even for a pump that has not been removed.