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Old 06-13-2017, 06:38 PM   #1
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12 volt water pump won't pump water

OK so I can't get to get the 12 volt water pump to put out pressure so I went out and bought a new pump and installed it today. Still can't get it to pump. My coach is a 2005 holiday rambler.
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Old 06-13-2017, 06:43 PM   #2
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Your valve has to be turned to City for it to build pressure. It doesn't make much sense looking at it, but you're basically just leaving the valve open if it's turned to Tank.
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Old 06-13-2017, 06:50 PM   #3
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The most obvious and first check would be to see if you actually have water in your fresh water tank.

Do you have any pressure at all?

Does the pump run?
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Old 06-13-2017, 07:15 PM   #4
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I assume the pump is running and getting power, if so check the clear plastic (bubble)screen directly connected to thw pump on the outtake side. When we cleaned our water tank we have this plug up a few times.
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Old 06-13-2017, 09:29 PM   #5
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I think Hartman 2112 gave you good information. On our coach, there is a valve labeled "City Fill". That valve need to be closed for the pump to build pressure. Otherwise it just pumps the water back into the fresh tank and doesn't build usable pressure on the system.
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Old 06-14-2017, 06:35 PM   #6
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Thanks for all the feedback. Tried them all and still no luck. I do have the water tank full. It's got to be something simple like a valve not turned right. The older gentleman I bought from is not able to help due to health.
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Old 06-14-2017, 06:56 PM   #7
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Can you post a picture of your valves?
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Old 06-14-2017, 07:39 PM   #8
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Is the valve between the tank and the pump turned on? Easy to overlook or forget.
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Old 06-14-2017, 10:46 PM   #9
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Do you have pressure at your low water drain point?
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Old 06-15-2017, 07:59 AM   #10
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You may have air in the line prior to the input. See if there is a winterizing valve you may have a hose fitting that is used to inject antifreeze. Try running water into that connection to prime the pump.
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