Flojet 4405-143 Leak Problem in caravan

Hi
It would appear that the mains water is being feed to the pump inlet & that will allow a forward flow of water through the pump
I would have expected it to be feed into the system After the pump.
Perhaps another faulty set up !!??

Peter

Which side of the pup is leaking.

Most vans have the mains feed come into the line after the pump so that the high pressure doesnt go through it and the pump has a one way valve AFTER it so the the high pressure cant backfeed into it

Are you sure thats not how it is and the one way has a bit of dirt in it and holding it open

Where is the water leaking from ?...a joint in the pipe ? ...which one ?...it really sounds like connections need to be tightened to handle the extra pressure coming from the town water connection....had this problem and it was a bitch to fix , very tight space under the sink for a big man to move in... and I doubt if the pump is the problem ..............

If the pipes have John Guest fittings they can come loose over time and will leak under too much pressure. Could be one of the collets has let go and causing a leak

It should perhaps be noted that the pressure regulators sold in the garden irrigation section of Bunnings and elsewhere only reduce the pressure while there is a flow through the regulator. If the flow is closed off after the regulator or if the flow is reduce below a certain amount, then the pressure rises above the nominated setting.

Reliable regulators capable of controlling pressure at all flows are obtainable from plumbing suppliers.

Geoff
being a plumber would say you need a non return valve or a one way or a check valve on the out let side of the flo jet pump to stop the two water pressures cross feeding.the town water pressure is back feeding into the pump. im surprised you blown the seals in the pump.id suggest a one way valve make sure the arrow on the valve is facing away from the pump if no arrow blow thru the fitting to see which is the flow direction. just remember it has to suit the low pressure of the flow jet not town water or the valve wont let the water thru from the pump hope it helps Dags

Hmm I did say that in earlier reply.

Go to a Caravan repair place and get them to look at it and see if it has a one way valve after the pump.

They, as I have already said can get a bit of crap in them and let the high pressure backfeed causing a leak from the normally low pressure piping.

Shouldnt be too hard to get in there and look to see where its coming from.

Geoff, after some research I found info that may help:

1. The Flojet pump is a diaphragm type positive displacement pump. Being of positive displacement design it requires a bypass device to prevent compression damage if the delivery line is shut off. This device is built into the pump and need not concern you.

2. The "35psi pressure switch maximum" is the highest setting that can be made on the pressure switch. It is not the pressure rating of the pump body.

3. I have not been able to find a specification for the maximum pressure that the pump can withstand. The manufacturer of Flojet Pumps does not include this in their specifications, probably because they do not expect the pump to be connected to an external pressure source. However,seeing as how Caravans Plus advise connecting the mains water directly to the pump delivery line I would assume that they consider the pump capable of withstanding mains pressure. Some mains pressures can be quite high and I would not be happy connecting the system without a pressure reducing regulator set to say 35psi.

4. Diaphragm type positive displacement pumps incorporate valves as part of the pumping function. These valves would prevent back-flow and accordingly an external non-return valve would not be necessary.

5. If it were my setup I would not allow connection of the mains water to the pump at all. I would have a manual 2 position change-over valve which connected the system to either the mains or to the pump as I chose. Then there is no issue with back-pressuring the pump.

Hi I dont think the pump is at fault. The 35psi noted on the pump would be the cut out pressure and a cut in of around 20psi. If mains water is fed through the inlet it will over pressure the pump an cause it to leak. I fed on the out llet side the same will happen. you need to feed the water after the pump and install a small non return valve between the mains inlet and the outlet of the pump to prevent mains pressure. Hope this helps