Check the valves and lines
I am also a new 345 owner (1986) and had problems with water pressure when I was getting the coach ready the first time. Ours turned out to be a combination of things including; three broken pipes, open winterization drains and rubber washers in the shower handle.
Here is what I learned from other members on the forum and in getting the plumbing working again in our 345;
If all of the outlets are closed (kitchen, bath, shower, potty) and the pump never stops pumping (you can hear it in the bedroom) or pulses on an off frequently then you either have a leak in the system somewhere or an open drain valve. I had repaired two of the three breaks in my plumbing and would get pressure at first then a fade and it turned out to be small crack in the shutoff valve on the potty.
If the pump stops pumping after a few seconds then you are reaching line pressure behind the pump. Since you are getting an initial pressure check to make sure the pump is getting enough water. Is the tank full? (The first time I filled my tank I left the drain valve open and within 60 minutes it was empty again.) Also check to make sure the valve between the tank and the pump is open. Ours has a pump saver in the feed line going into the pump. This is a basicaly a screen filter and can be easily opened and cleaned out.
Most of the major drains and plumbing connections are made under the bed (ours is a side queen bedroom and there is a little access panel next to the bed which unscrews and you get get to everything). These valves are a little confusing but if you stare at them long enough they start to make sense.
I also searched the forums a lot for "plumbing" and "water" and found a ton of ideas.
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Steven Webster
1986 Airstream 345 Classic Motorhome
AIR 1760
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