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Old 01-27-2007, 01:23 PM   #1
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kontiki's Avatar
1989 25' Excella
San Andreas , California
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Posts: 60
Water pump

I have a 77 Argosy. The water pump seems to come on and off when there is no demand for water. I have checked for leaks and can find none. The pump is an Shurflo model 2088-403-444 and has a mfg date of 12/98. Is there a check valve in the system or are there any adjustments on the pump? Appreciate any and all suggestions.

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Old 01-27-2007, 02:03 PM   #2
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1986 34.5' Airstream 345
Louisville , Kentucky
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Something is causing the pressure switch to turn the pump on again...that's typically a leak somewhere.

Steven Webster
1986 Airstream 345 Classic Motorhome
AIR 1760
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Old 01-27-2007, 03:13 PM   #3
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Water may be leaking back through the pump reducing the pressure and causing the pump to cycle. There may be something stuck in one of the rubber one-way valves in the pump. You can remove, disassemble, clean and reassemble the pump and probably solve the problem. I'd be very sure there are no leaks elsewhere in the system first. Darol
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Old 09-23-2010, 07:17 PM   #4
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Kontiki here are a few places to check for leaks.
1) Low point drains that are used to drain the water system. They amy be dripping outside and dropping the pressure.
2) The city water connection. It has a check or one way valve to only allow ater in from the city connection and not out from the water pump pressure. It may be leaking back out and dropping the pressure.
3) The pressure relief valve on the water heater. If it is leaking slightly it may cause the pressure to drop and the pump to activate.
Check these areas first before condemning the pump and rebuilding. Just because there is no water leaking into the trailer it doesn't mean the system is leak free.

Gosman your description of the pump operation sounds like it was operating properly. If you turn on the pump with an empty tank it will continue to run because it has no water to build up the pressure in the system.
If you turn on the pump with the tank full the pump will run and water pressure will build up in the system until it reaches the correct pressure and the pump will stop. As it reaches pressure the sound of the pump does sound like it is slowing down.
Fill the fresh water tank again, turn on the pump and open a tap to allow water to flow. As the pressure drops the pump should start to run again. Close the tap and the pump will continue to run until the system is pressureized and then stop. Try this at every tap and at the toilet and the same sequence should reoccur.
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Old 09-23-2010, 09:49 PM   #5
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Did you open a valve at the sink to see if you have water? Maybe the pump stopped because the pressure built up aand no faucets were open.
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