Quote:
Originally Posted by Texas Shriner
That's nice and all; but, the solution can be found in a typical RV plumbing diagram and pump specification. The 12v pump can see line pressure and from the specification "Inlet pressure must not exceed 30 psi [2.1 bar] maximum...."
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Look at the diagram the YOU provided. The water pump is drawing water from a VENTED freshwater tank. How is that pump going to get 30 psi at the inlet unless you block the vent on the tank and pressurize it to 30 psi, which will likely blow up the tank because it is not designed to be pressurized. Yes, the pump may have a 30 psi limit on the inlet side - and in an RV installation the only way it will see even 1 psi at the inlet is if something is very drastically wrong.