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Old 08-22-2003, 07:22 PM   #1
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Join Date: Apr 2003
Posts: 119
water pump pressure

My water pressure from the on board pump is at an acceptable level when the faucet is turned on intitially. It then drops off quickly to a slow stream with little pressure.
Is this how it is supposed to work when operating from the on board pump? I am new to the coach so I do not know if it was ever any better. (1988 Classic Motorhome)

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Old 08-22-2003, 07:59 PM   #2
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Tipton , Iowa
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pump action...


You will have reasonably good pressure when you first open the faucet after the pump has stopped. It will drop off as the pressure drops and the pump kicks back in. After that, you'll get the volume of water that the pump is capable of moving. The volume isn't going to be great, and not under a lot of pressure, but it should be adequate.

If the volume is really low, it may be time to replace your pump.


AIR 2053 Current: 2006 Born Free 32 RQ Kodiak Chassis, & 1995 Coachmen B-van
Former Airstreams: 1953 Flying Cloud, 1957 Overlander, 1961 Bambi, 1970 Safari Special, 1978 Argosy Minuet, 1985 325 Moho, 1994 Limited 34' Two-door, 1994 B190 "B-Van"
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Old 08-22-2003, 08:08 PM   #3
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1969 31' Sovereign
Broken Arrow , Oklahoma
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Check & or replace the in line filter as it can cause the problem.

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Old 08-22-2003, 09:38 PM   #4
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1986 34.5' Airstream 345
Louisville , Kentucky
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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.
Steven Webster
1986 Airstream 345 Classic Motorhome
AIR 1760
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