If I switch it on, the pump runs and the water flows but then slows to nothing as if a vacuum is being created
To stop this from happening I open the sink tap in the bathroom. I don't need to open enough to flick the pump just slight crack (as I first though the sink may flick the pump which created water pressure to open shower head).
I have recently replaced the sink tap, that we found on our first trip after buying the van, had a crack in and so now sealed...
we need to know if your van has micro switches on the taps , or a pressure switch system.
if each tap has a micro switch then the one on the shower is at fault .By opening the sink tap your causing the pump to work via the sink tap.If you have a pressure switch the this may need adjustment
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