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Old 09-23-2021, 08:33 PM   #1
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Water pump stumped

Howdy. 2016 Shasta 25rs owner. Water pump system on the fritz. I replaced the pump & no help. Looked under rig saw a kinked 1/2 inch hose section which I cut out and joined with 1/2 inch insert and clamped it down. Put water in fresh water tank turned on pump which I hear turn on but no water into system coming through. No idea next step other than asking community for advice. Thanks.
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Old 09-23-2021, 08:45 PM   #2
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So the new pump runs, correct? First make sure the pump is in correctly and not reversed. If correctly installed, it might be a matter of getting the pump primed. You might try hooking up to city water, turn on the city water open a tap and turn on the pump, perhaps that will force water through the pump and get it going.

Another thought, any chance the wires to the pump are reversed, causing the pump to run backwards?

I'm sure you will get some better ideas !
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Old 09-23-2021, 10:42 PM   #3
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Howdy. I Unhooked the battery and plugged to shore power.. turned on pump.. no water. When I unhooked the old pump I did make sure the wires were replaced in the same position on the new same as old pump as old but you never know. How to check that? I know this has a simple solution but it is evading me.
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Old 09-23-2021, 10:43 PM   #4
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I will hook it up to city water tomorrow and report back what happens. Thanks
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Old 09-24-2021, 10:43 AM   #5
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Howdy. Hooked up to city water opened galley faucets turn on pump & no change in status mentioned before. Still thinking & requesting advice..
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Old 09-24-2021, 10:48 AM   #6
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Any chance the valves are in the winterize position?
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Old 09-24-2021, 10:54 AM   #7
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Does the new pump have a clear strainer?
Is the water in the strainer?
Depending if the pump is mounted low enough, you might have to fill the fresh water tank to the top to get it to prime.
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Old 09-24-2021, 10:58 AM   #8
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The pump has 3 wires: a red one from the top of pump to bottom of same.. a black one & a red one which I connected as was on the old pump..
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Old 09-24-2021, 11:09 AM   #9
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Howdy. I have not messed with the valves since I bought the trailer & to winterize I hook up my shop vac to the low drain valves in back air out the water. I do no t have a clear strainer of new pump although the old one did. I will fill fresh water tank all the way up to see what happens. Generally when we travel I put less than 5 gallons of fresh water just to use the head when we travel. We are not boondockers and prior to this no problem with old pump.. I will report back on tank fill..
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Old 09-24-2021, 11:29 AM   #10
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Hope this picture of new pump install shows up
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Old 09-24-2021, 12:05 PM   #11
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If you have a valve on the inlet side to the pump that allows for pumping antifreeze into the system make sure it is closed, or in the fresh water position if three way, My trailer has a tee in the suction line, one has a valve and goes to fresh water tank, the other leg has a valve and goes to just a hose to stick into a bottle of anti-freeze.
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Old 09-24-2021, 12:24 PM   #12
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There are three valves: 2 are perpendicular to the 1/2 hose and one is closed. I believe the closed valve services the winterizing/anti freeze system which as mentioned previously I have never used.
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Old 09-24-2021, 12:33 PM   #13
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You could reverse the valves and put the suction for antifreeze into a container of water and see if you can pump from that.
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Old 09-24-2021, 12:45 PM   #14
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Howdy. So per thepicture of the valve at at the very bottom appears to be for fresh water and is open.. the one above it is a short hose the end of which is in a 5 gallon jug.. the very top one one the red hose is open but I believe that may have something to do with the water heater. So do you mean close the very bottom valve.. open the one on top of that.. put water in the jug.. turn on pump and see if it pumps water out of the jug?
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Old 09-24-2021, 01:00 PM   #15
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Howdy. So I reversed the valves. Put water in the 5 gallon jug.. put end of hose in jug.. turned on water pump and it did not suck the water out.. instead it was blowing air into jug. That must mean one thing I believe
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Old 09-24-2021, 01:43 PM   #16
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Quote:
Originally Posted by nephi007 View Post
Howdy. So I reversed the valves. Put water in the 5 gallon jug.. put end of hose in jug.. turned on water pump and it did not suck the water out.. instead it was blowing air into jug. That must mean one thing I believe
Likely the pump is installed backwards. The inlet and outlet on the pump should be marked, or at least a flow arrow. These are diaphragm pumps, they will not pump backwards if the wires are reversed so I would not be looking at that.
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Old 09-24-2021, 02:52 PM   #17
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Howdy. This is pix of old pump as mounted on wall. I mounted new pump in exactly the same way. I believe The left inlet is for water coming in from fresh water tank and the right one is for disbursement of water through system. I donít know what backwards means. Can you please explain? As far as I can tell I removed old & replaced new pump in exactly the same way.
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Old 09-24-2021, 03:01 PM   #18
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And this is picture of new pump as installed. Left is for water coming in and right is for water going out.
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Old 09-24-2021, 04:52 PM   #19
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Howdy. I removed pump attached threaded elbow to intake valve and a 1/2 inch pvc to other end of elbow & into a jug of water. Attached + and - wires of pump to battery and water flowed out of jug through out take valve. Pump is good. I tested old pump and itísí good too so now I have an extra pump. Back to the drawing board.
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Old 09-24-2021, 04:53 PM   #20
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Quote:
Originally Posted by nephi007 View Post
Howdy. I removed pump attached threaded elbow to intake valve and a 1/2 inch pvc to other end of elbow & into a jug of water. Attached + and - wires of pump to battery and water flowed out of jug through out take valve. Pump is good. I tested old pump and it’s’ good too so now I have an extra pump. Back to the drawing board.
Does that mean your issue is resolved? The original pump was installed backwards? Or does that mean by directly connect a buck of water directly to the pump, it will pump, but when it is connected to the system it won't pump from the fresh water tank?
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