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Old 06-04-2015, 02:43 PM   #1
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Can't get water pressure with pump . . .

2008 Eagle 299RLS 5er. Issues: Pump runs, but never pressures up the lines. I kn0ow the pump is good as I have tested it, and had it tested. When pump is on, there is water coming out of the two "hoses" under the fresh water tank.
One of those hoses is the overflow for the fresh water tank. Not sure what the other is. Tank is full. All plumming works great (leak free) when hooked up to "city water".
It's as if there is a valve not closing on the top of the fresh water tank that is not allowing pressure to build and in fact allowing water to trickle out.

HELP~!!~
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Old 06-04-2015, 02:48 PM   #2
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I am not an expert in this area, but believe there is a backflow preventer between the pump and the tank. It could be that the backflow preventer is bad. The pump would pressurize the lines and the pressure would then push the water out of the tank. There is also an inline filter near the pump. You could unscrew the clear housing and clean the screen. Maybe it is plugged up. Do you get any water flow/pressure at all in the lines when the pump is running? I'm sure others will chime in to help.
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Old 06-04-2015, 03:01 PM   #3
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If the pump runs, never pressures up, and water is exiting underneath, that means there is a opening somewhere, for the water to flow out. Have you checked your by-pass setup at water heater?
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Old 06-04-2015, 03:03 PM   #4
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I don't believe the water heater bypass could cause this to happen. All it may do, if all the valves are closed, is to stop water from traveling through the hot water line. The cold water should still flow just fine.
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Old 06-04-2015, 03:55 PM   #5
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Also check to see if you have a loose piping connection on the suction (inlet) side of your water pump. Also check your pump inlet strainer (if so equipped) for clogging. You may even have a low point drain with an open valve between the water tank and the pump.

My MH had the inlet connection vibrate loose from the pump and I had the same symptoms when I de-winterized it this spring. My unit also has a low point drain before the pump that I left that open accidentally. No surprise I was standing there wondering why my pump would not build pressure.

In both my cases city water worked just fine. Sucking air instead of water doesn't make for good pressure!
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Old 06-04-2015, 04:59 PM   #6
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Do you have a winterization kit on this unit? Perhaps the valve is still open and sucking air in the draw side of the pump.
Above replies have covered most all other issues. Last resort is the impeller is bad possibly.
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Old 06-04-2015, 07:13 PM   #7
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Filter is brand new and tight, as is the pump connections. Not water heater or other loose pipe/fittings. I have just replaced stuff and know things are tight.
This has been bugging me for almost a year!

Where is the backflow preventer on my camper?
If it's on top of the holding tank, that's probably it.
Key: water is trickling out of two hose from top of tank when pump is on.
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Old 06-04-2015, 07:18 PM   #8
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see if you can plug the city water connection then try your pump.


There should be a check valve on the city water connection.


Not sure if this will help you but it may be worth a try.
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Old 06-04-2015, 07:43 PM   #9
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Most back flow valves, that i'am aware of, are on the black tank flush line. Do I see a on/off valve on the one line? I have two low water drains, and both have valves on them. Water will drain if ether is open.
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Old 06-04-2015, 08:50 PM   #10
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Pump wired backwards?
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