Fresh Water System loss of pressure (1 Viewer)

[Homer-Adria]

Hola,
the freshwater system on my Hymer keeps losing pressure when taps are turned off. Its quite small but enough to require the hotwater circuit to need regular re-priming. None of the taps leak and there is no apparent leakage from pipework. Ive not checked the pump yet but is it possible that water is flowing back into the FW tank?
Im guessing there are some one-way valves somewhere along the line or even built into the pump?

Any ideas or suggestions please.

thanks

 

[Reallyretired]

There will probably be a non return valve either in the pump or in the pickup pipe. They can get a bit of grit in them causing a slow leak back.

 

[xsparks]

The pump its self can develop a leak mine did.

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[Homer-Adria]

ok, thanks