Originally Posted by bstreep
I'd guess a restriction. A restriction would allow pressure to build up, yet not yield much flow.
As Bill suggests, a restriction in the pipe between the pump & faucet, would allow pressure to build behind the restriction. This would prompt the pressure switch to keep the pump off, until faucet opened, dropping pressure. When faucet opened, the pump would deliver a reduced quantity of water past the restriction, at a reduced pressure. Pressure would be high in fromnt of restriction, but low after.