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Old 02-08-2014, 03:48 PM   #1
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Water pump won't shut off??

I never tried to use the fresh water pump in my "new to me RV" before today.

Always used the city water hookup. Today I turned the pump on for the first time and it doesn't stop running. And there ever little water pressure.

It's ShurFlo model #2088-403-144 pump. Pump says it's a 2.8 GPM pump.

My questions are:

shouldn't the pump ran for a minute and then shut off?

Do you think my pump is bad?

Is so can I replace it with a higher volume one, like a 3.5 GPM pump?
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Old 02-08-2014, 03:54 PM   #2
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Do you have water in the tank? Mine will do that when My tank is running dry. No wtaer for it to pump means the pressure switch wont see pressure to shut it off.
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Old 02-08-2014, 04:01 PM   #3
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You may also have a "Y" valve that is still in the winterizing position and needs to be turned back to the fresh water tank.
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Old 02-08-2014, 04:03 PM   #4
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If you have a valve that goes from fill tank to city water and you leave it on the fill tank position , the pump will run as you described ( on my Bounder ).
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Old 02-08-2014, 04:45 PM   #5
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Do you have a water pressure gauge? If the pump's impeller is worn it won't achieve enough pressure to shut off.
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Old 02-08-2014, 06:55 PM   #6
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I am going to paraphrase some of the other posters and add a bit

Do you have water in the tank if no water it wont pressure up
Do you have city water available where you are. If you have city water hook up to it leave the pump on the city water should pressurize the switch enough to shut the pump off.

Is it cold where you are and possibly you have frozen lines ?


Tell us the answers to the above and we can maybe help you from there
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Old 02-08-2014, 07:16 PM   #7
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Just wanted to clarify something first, I have a on/off switch for the water pump. The pump runs all the time when I turn it on. It doesn't ran when the switch is in the off position.

When I turn the switch on the pump runs and I can get water at all the faucets. But I don't get very much water pressure. It hardly even comes out of the shower head.

I opened all the faucets and ran the pump for about 5 mins. to try and see if there was any air in the lines. But still get them same results. Pump runs continually and hardly any water pressure.

No leaks under the coach, or inside anywhere.

The valves are in the position shown in the pictures (Which is suppose to be correct). See pictures
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Old 02-08-2014, 07:17 PM   #8
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Quote:
Originally Posted by t55watson View Post
Do you have water in the tank? Mine will do that when My tank is running dry. No wtaer for it to pump means the pressure switch wont see pressure to shut it off.
Tank is full
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Old 02-08-2014, 07:18 PM   #9
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Quote:
Originally Posted by ImagineIF View Post
Do you have a water pressure gauge? If the pump's impeller is worn it won't achieve enough pressure to shut off.
No pressure gauge
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Old 02-08-2014, 07:23 PM   #10
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Quote:
Originally Posted by gemini5362 View Post
I am going to paraphrase some of the other posters and add a bit

Do you have water in the tank if no water it wont pressure up
Do you have city water available where you are. If you have city water hook up to it leave the pump on the city water should pressurize the switch enough to shut the pump off.

Is it cold where you are and possibly you have frozen lines ?


Tell us the answers to the above and we can maybe help you from there
Tank is full, I have city water. So I'll try this in the morning. Warm here today (Atlanta, GA.)
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Old 02-08-2014, 07:36 PM   #11
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Can I just pull the water pump water inlet hose off and see if the pump actually has any suction?
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Old 02-08-2014, 07:36 PM   #12
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Connecting the pump to city water won't activate the pressure switch because city water is on the inlet side of the pump. The pressure switch is activated when back pressure is detected on the outlet side of the pump.

Remove the pump and connect a hose on the inlet side, drop the hose in a bucket of water and connect a 12 volt battery. The pump should run freely and move the water through the triple diaphragm, not the impeller becaue there isn't an impeller.

It's possible the front of the pump housing is broken or loose, therefore sucking air. It's also possible the pump motor is hanging up due to rust intrusion inside the pump stemming from a worn or bad seal.

Those pumps are easy to repair with a kit providing it isn't too old. A replacement pump of higher pressure is less than 100 dollars whereas the pressure switch will run about 35 dollars.

They are simple pumps but they do last a long time and will pump water if water is available.
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Old 02-08-2014, 07:40 PM   #13
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Quote:
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Can I just pull the water pump water inlet hose off and see if the pump actually has any suction?
You can do that but you still may want to remove it and do an inspection of what may be causing the problem unless it's obvious like a cracked or loose pump head.
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Old 02-08-2014, 08:11 PM   #14
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Well now the pump won't even push any water thru it. Motor runs, but no water. Ran the pump for about 15mins straight and can't get any water out of the faucets.

I going to pull the pump out in the morning and try to see if it will suck water from a bucket of water.
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