not sure if this is the same problem but we took delivery of our used hymer last week and noticed poor water pressure in the shower. We then found a slight (though increasing) leak in the floor space. It was quickly diagnosed over the phone by one of Hymer UKs engineers as a faulty pressure valve in the supply line, apparently the loss of, or intemittent, pressure is a classic symptom. It is a simple job to replace the valve, couple of clips and 10 minutes. As we had only had the van a couple of days Hymer UK insisted on sending a driver up on the train to take the van back to their workshop and fix it (there are a couple of other very small niggles but we live 300 miles from their workshop). How about that for customer service
Chris

Wondering if this is ok. I noticed poor water pressure even though everyting seems to work ok. What I found was the plastic connections at the pump were leaking. So I put two hose clamps on them and now the pressure is greater. I'm wondering if there is any problem here. Are the connections designed to pop off if the line is plugged for example.

Our pump works O.K. for a bit, then starts to 'scream' and the water pressure drops.

Can't decide if the pump is knackered or if the noise is 'cavitatiing' within the pump because the input is blocked.

The pump seems to be in the tank - at least it is below a round screw top under the floor on top of the tanks.

Sill under (used) warranty so going back soon to be fixed.

Hymer B Klasse 544 '02 plate.

Our year 2000 644 had a similar problem. The pressure was low and when I looked inside the tank the water was churning around. Still under warranty also but I just put hose clamps on the two ends of plastic tube that seemed to be coming lose and the problem was resolved saving two trips to the dealer an hour away.

I had a leak which now repaired gives great pressure. It was in the plastic release valve

Check pump and one way valve.

Unscrew large ring on top of tank ( located under hatch in floor )

Pipework and pump will be connected to lid of tank, lift out unscrew knurled ring to release pump.
submerge pump open tap check pressure if ok check one way valve which is in the connecting pipe of the knurled ring that you have just undone.

These can block partly with dirt etc.

Good Luck

Cliff

we replaced our water pump with one to give better pressure great; then all the joints started leaking. Have replaced with a less powerful one now, so beware increasing pressure is not such a good plan.

My pump was "screeching" too & I've just fitted a replacement [the 12litre model - although on reflection I wish I'd got the 18litre model
http://www.caravanspares2repairs.co....pumps-68-c.asp