Water pressure pump in camper keeps priming

There has to be a leak somewhere, mate, otherwise it wouldn't happen.

A slow drip in a tap, perhaps, though you've said no leaks, so maybe not?

It COULD be an internal leak in the pump - one of the valves might have a bit of grit in there, in which case you might have to strip it down, clean or replace bits and see how you go.

I've never had to do this myself so I don't know about availability of parts. Camec (www.camec.com.au) might be able to help. Or Whitworths Marine (www.whitworths.com.au).

We have a small storage hot water system. The thermostat failed once and it overheated. Combinationof heat and pressure made one of the plastic hot water lines burst. Fortunately we were there to intervene, but ever since then we switch pumps off when we've finished with them. Yes, it reduces convenience, but it beats the hell out of a boot full of water.

Cheers

Hi Serendipity, It could be the in line not getting water, mine did that and found that the hose had a kink in it restricting the flow to the pump.
Andy

I frequently have the same problem, I Have now fitted a 12v switch next to the tap that i just switch on & off when i want the pump to operate so I don't have to listen to it any more.

If there is no leaks on the output side of the pump then it has to be the inlet valve not seating and letting some water leak backwards into the intake line.
You will have to dismantle and check the valve and the seat of the valve. They have to be perfect for it not to cycle.

Had the same issue with my Flojet pump - the principle of operation would probably be the same as yours - on the face of it, you'd think the pump is simply responding periodically to a tiny leak and subsequent loss of pressure in the line - but I couldn't find the tiniest leak anywhere - when I dropped in to the van factory, the foreman alerted me to making a small adjustment to the pressure switch on the base of the pump - that did the trick - I guess the adjuster defines the actual pressure at which the pump cuts in and it was set too fine. That doesn't explain why the pump was NOT running sometimes (good), but I'm happy :-o).

I have this problem with my caravan. If you have a mains water connection, near this connection there is a non return valve. This valve does not always seat when the water is disconnected. A gentle tap will seat the valve.

Thanks for the answers everyone. I will now be looking at either stripping down the pump or looking for an adjuster to drop the pressure.

With no visible signs of a small leak I suspect it might be in the pump with a non-return valve leaking a bit.

Cheers

Serendipity