No Water Pressure

[Clyde2FJ40]

Water system won't pressure up. I can turn the pump on and it runs but wont pressure up the system. When I turn it off I can hear water back flowing into the holding tank. Can hook to shore water and everything is fine. I believe it's the check valve.......question is....where is it and where can I get one ?? Thanks !!!

[donn]

I first have to ask the obvious, do you have enough water in the tank? A check valve normally is only necessary to maintain a pressurized system when the water pump is turned off. And it is typically built into the pump.
First things first, add water to the tank, then disconnect the outlet of the pump and see if you get water when the pump is turned on. Yes/no? Yes, connect back to the system and go turn the pump on again and bleed the system. NO, clean the filter screen and or replace the pump.

[Clyde2FJ40]

Donn....yes, the tank is full. Will try your other suggestions and see what happens. Thanks.

[milzat]

Clyde,
The links below may help.

RV Water Pump

How To Diagnose Water Pump Problems Before Repairing Or Replacing RV Water Pumps

Water, Water, Everywhere!

[Willis]

Originally Posted by Clyde2FJ40

Water system won't pressure up. I can turn the pump on and it runs but wont pressure up the system. When I turn it off I can hear water back flowing into the holding tank. Can hook to shore water and everything is fine. I believe it's the check valve.......question is....where is it and where can I get one ?? Thanks !!!

Do you have a bypass near your pump for winterizing? Perhaps the valve is open so it's just sucking air?

[Hokiehall]

Originally Posted by Willis

Do you have a bypass near your pump for winterizing? Perhaps the valve is open so it's just sucking air?

I did that once and had the same problem you are having. Check to see if you have a valve near the water pump that needs to be opened to allow water from the tank into the lines.

[LadyWindrider]

Let's see what we have here. City water connection works. We can assume plumbing is in pretty good shape. Have no idea of the year/model of the camper since it is not in the signature. Don't know if you bought it new or used.

Does this trailer have a water pump winterizing kit on it? This would be a valve on the suction side of the pump to draw antifreeze in to the pump instead of water from the supply tank? Sounds to me like a supply problem for the pump. The check valve in question here, won't keep you from pumping water normally, it is there just to maintain pressure when there isn't any water flowing. The pump should pump water without a check valve, and I think most are inside the pump. Find the pump, and look at both the inlet and outlet side side hoses. Maybe there is a valve there.