Paul at this point you should call Kermit at the factory. He may have an idea about your problem. Yes I see you purchased it used, but Kermit stands behind all PC regardless of how many people have owned it. Is the pressure restricted for both the cold and hot water?Have you tried hooking it up to the spicket without the pressure regulator? The water system can handle up to 100 psi without any problems. If there is anything in the line, this might blow it to one of the facets and the others should work after that. I would use the bathroom sink first as this is the easiest to take apart on the 2350. This is what I would do, but if you are not comfortable doing it, wait until you talk to Kermit.
We seldom camp where hookups are available but when we do we still use the pump and water supply from our fresh tank, refilling it as needed with the campground water. Why? Because we don't have very good pressure if we are hooked up directly to the campground water supply.Now, I have checked out just about everything. I have a water pressure gauge I carry that has a female hose connection attached. I can check water pressure at the source, at the end of the hose after the water supply has gone through my regulator and hose, etc. Water pressure is 40 psi at the end of my hose, exactly as it should be. The pressure of the water coming out in the sinks in our 2013 PC 2350 is about 1/3rd of the pressure with our pump and is essentially not usable for showering, etc. I have checked the filter screen in the input connection on the PC. As a matter of fact, the original back flow check valve failed and I replaced that with a new input connection and a new check valve. They work perfectly. I have removed the bed and accessed the plumbing underneath. I have checked for kinks in the plumbing lines, crimps, everything on every pipe that is accessible. No problems. The only conclusion I can come up with is that the supply line is crimped or impeded somewhere behind the wall between the hose input connection and the accessible/viewable plumbing. Please remember the pressure is low at all outlets: both sinks, toilet, shower, and outside shower....every outlet. SO....the problem must be in the main supply line somewhere and I have just about given up. I don't intend to tear out the shower walls to try to find it!Does anyone have any thought or has anyone experienced a similar problem? I assume the plumbing routing will differ from model to model. The whole system works perfectly fine with the water pump.Paul