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Message: <blockquote data-quote="cowadle" data-source="post: 4063749" data-attributes="member: 7203"><p>with a positive displacement pump as in some rv services the pump has it's own pressure switch and no pressure tank. the pump will pressurize the supply line to whatever the set pressure is and then shut off. as soon as someone cracks a valve or shower the immediate drop in pressure turns the pump on and it will deliver it's rated gpm at head. if this is enough gpm then all you will notice is a very quick delay then water as long as the pump doesn't build up enough pressure to trigger the pressure switch. then as soon as the valve is closed the pump rapidly builds pressure and triggers the pressure switch and shuts off.</p></blockquote><p></p>