help with plumbing problems

[firelaw]

I need help please. Two problems.
Firstly I have a 2005 Cardinal 34XL fith wheel.
*The water pump keeps cutting in and I have found problem but not sure how to fix it. The pump draws from the holding tank, runs up a line to the filter, through the filter and then on into the supply lines for fawcets, shower etc. So far so good, all this works fine. The problem is, is the water drains back down the line from the filter back to the pump and then the pump kicks in to bring up the pressure. Anyone know how to solve this problem??
*Second problem is at the city connection for water line. There is a check valve of some kind, a neoprene rod with a spring and a neoprene retainer, which is supposed to activate when pressure is applied (I think) and provide a good flow to the trailer. It is not working properly and I am not sure what or how to tale apart to correct problem. Anyone able to advise or direct me on this.
Thanks you,
Paul

[TURBS]

Originally Posted by firelaw

I need help please. Two problems.
Firstly I have a 2005 Cardinal 34XL fith wheel.
*The water pump keeps cutting in and I have found problem but not sure how to fix it. The pump draws from the holding tank, runs up a line to the filter, through the filter and then on into the supply lines for fawcets, shower etc. So far so good, all this works fine. The problem is, is the water drains back down the line from the filter back to the pump and then the pump kicks in to bring up the pressure. Anyone know how to solve this problem??
*Second problem is at the city connection for water line. There is a check valve of some kind, a neoprene rod with a spring and a neoprene retainer, which is supposed to activate when pressure is applied (I think) and provide a good flow to the trailer. It is not working properly and I am not sure what or how to tale apart to correct problem. Anyone able to advise or direct me on this.
Thanks you,
Paul

1) sounds like check valve is stuck.
2) just replace city check valve there is no fixing.

Fix problem 2 and it might fix issue 1

[Herk7769]

The check valve that F1100Turbo is talking about is not the city water (outside inlet) check valve; but the one internal to the water pump. It may have debris in the valve keeping it from closing once there is pressure in the system.

Some pumps have a rebuild-able pump and check valve assembly and others don't. If under warranty, you want a new pump. If not, check to see it it is Shurflo and order a rebuild kit.
Classic Series Water Pump - SHURflo

RV Water Pump Parts - ShurFlow, FloJet, others - PPL Motor Homes

The CHEAP fix is to put one of these between the pump and the water tank.
Check Valve, 1/2" MPT x 1/2" FPT

[Dave_Monica]

It sounds like you have only one problem...the check valve on the city water connection isn't holding. Water leaks out the city connection and the pump then runs to build the pressure back to setpoint. The city connection with check valve needs to be replaced.

Dave

[Herk7769]

Originally Posted by firelaw

*Second problem is at the city connection for water line. There is a check valve of some kind, a neoprene rod with a spring and a neoprene retainer, which is supposed to activate when pressure is applied (I think) and provide a good flow to the trailer. It is not working properly and I am not sure what or how to tale apart to correct problem. Anyone able to advise or direct me on this.
Thanks you,
Paul

When you say this is not working properly what do you mean? Is water leaking out and running down the side of the camper when you are running on internal water? If so, are you SURE that the pump is leaking back into the fresh tank?

If the city water check valve is leaking, you will experience cycling of the water pump also. It may be your ONLY problem as both Dave and Turbo suggested and there is nothing wrong with your water pump.