Looking at all the pumps with various PSI rates, what shouldI choose. I plan 2X86 litres of fresh water, kit, shower and WC. Are there van pumps that are TOO high in PSI output?
Thanks for any help
George W.

George, this is a typical pump... http://www.shurflo.com/rv-products/rv-p ... fault.html

I think mine is similar. Typical switch on below 30 psi, switch off at 45 psi, but adjustable. You don't need any more than 45 psi. Your internal plumbing system should be restricted to 50 psi by a pressure reducing/limiting valve, plus a check valve (possibly combined) fitted at the point where you connect to mains water.