Can't get water pressure with pump . . .

[dig4gold]

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~!!~

[ddrueckh]

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.

[arkhillbilly]

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?

[ddrueckh]

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.

[Robbbyr]

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!

[3'senough]

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.

[dig4gold]

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.

[bedrck46]

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.

[arkhillbilly]

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.

[mjlaupp]

Pump wired backwards?

[dig4gold]

Not wired backwards. Pressure from the pump is forcing water out the breather on the top of fresh water tank and not throuh the kines. The water lines put out mostly air, with some spitting of water occationally.
I'm in a remote part of Wyoming and really didn't want to haul it to the nearest Jayco repair joint . . . It'd be cheaper to buy another camper!

[ALJO]

First be sure your water system drain lines are close. If the bypass is set to winter position it doesn't matter. It just doesn't fill the HW Tank. Turn on the pump with a tap open. If after a couple minutes no pressure is built. Try a one gallon water bottle and connect it to the suction hose on the filter side of the pump. (Some system has this already installed with one valve towards the FW Tank and one valve towards this suction hose) Be sure when you use the suction hose the FW Tank valve is closed. Any time a valve is in line with the water line the valve is open. If it is cross wise on the water line it is closed. Good luck with your test!

[Scoutr2]

Originally Posted by mjlaupp

Pump wired backwards?

I'm leaning toward this explanation.

[Filthy-Beast]

Originally Posted by Scoutr2

I'm leaning toward this explanation.

or the hoses are reversed and it's trying to push into the tank.

[bedrck46]

Hopefully when the problems gets resolved the OP will post the results and we can all learn from his problem to better help the next person

[Scoutr2]

Originally Posted by Filthy-Beast

or the hoses are reversed and it's trying to push into the tank.

I would think not, because he states that everything works OK when hooked up to city water.



The image above shows that if the pump is running backwards, it is trying to draw water from the system and pump it into the FW tank. There could be some water dripping from a faucet or two when this happens, due to pressure differences in each circuit. And the pump is trying to pressurize the FW tank, which is causing water to dribble out the overflow tubes. There is probably air escaping through the vent line to the tank fill tube, as well. If that is happening, then this is definitely the problem.

Check for air escaping from the vent line. OR, try reversing the electrical leads on the pump to see if that solves the problem.

[morsev]

We have had this happen with our Jay Flight when one of the valves under the galley sink was in the wrong position, so blocking water from going through the pump.

[LarryJ]

Just had my TT in this week to dealer for similar issue, pump runs but no water to faucets. This worked initially then gradually just went to lots of air with water then no water. Service found that there was a bad clamp that allowed air into system and eventually caused what he said was an air-lock. Replaced clamp that ended air leak and all good... Note: Service Rep could hear the air leak that I could not when the pump was running.

Larry J
2015 SLX 264BHW
2007 Ram 1500 5.7L w/tow packarge, Equalizer 1000, Tekonsha Prodigy P2 Brake Controller
Priors:
Jayco Eagle 10 ST RD
Keystone Sprinter M-380BWS
Rockwood Freedom 1640TD
Jayco SLX 154BH
Still have seasonal (Hunting Shack): Taurus 26'

[troutslayer]

Originally Posted by LarryJ

Just had my TT in this week to dealer for similar issue, pump runs but no water to faucets. This worked initially then gradually just went to lots of air with water then no water. Service found that there was a bad clamp that allowed air into system and eventually caused what he said was an air-lock. Replaced clamp that ended air leak and all good... Note: Service Rep could hear the air leak that I could not when the pump was running.

Larry J
2015 SLX 264BHW
2007 Ram 1500 5.7L w/tow packarge, Equalizer 1000, Tekonsha Prodigy P2 Brake Controller
Priors:
Jayco Eagle 10 ST RD
Keystone Sprinter M-380BWS
Rockwood Freedom 1640TD
Jayco SLX 154BH
Still have seasonal (Hunting Shack): Taurus 26'

This gets my vote! It just sounds like air being sucked up instead of water and this seems like a logical explanation.

[dig4gold]

Thanks all. But I'm mostly puzzled that the pump is creating enough pressure to let water escape from the top of the FW tank!