water pump from fresh water tank

[ljedik]

Forgive me if I'm just confused, but I need help, just finished rebuilding my water system in my Class C and I can't seem to get my pump to pump from my fresh water tank? When I hook up hose from the house it builds pressure and stops pumping but when I disconnect the hose from the city connection, shouldn't it start pumping from the tank?

I have three hoses coming off the tank, one is the main fill hose, second is going to the pump and the third is breathing tube? Does it matter which is the breathing tube and the hose to the pump?

Can anyone shed some light?

[gklehner]

Any chance on a diagram here? On the surface, based on pressure from the city supply, it sounds like a check valve in the wrong location or corresponding wrong location of a connection. Also, not sure of your tank outlet/inlet arrangement. Doesn't seem like it would be possible to have both a breather line and pump suction both off the tank bottom. I would recommend you make a diagram of all your lines, pump, tank, valves, then flow paths for each. That should show you where the problem is.
This probably doesn't help much, but if you post a diagram may be of more assistance.

Good luck -

Greg, Karen and the kids (choc. lab and golden retriever).

[Dave78Chief]

You said:
[QUOTE]When I hook up hose from the house it builds pressure and stops pumping but ...QUOTE]

The pump is not used or needed when you are connected to a pressurized hose.

Below is a basic water system diagram

Dave