do u have a stream of water coming out before u start it? like mx said pump needs to be primed first. that is the trickle of water coming out before you start it. after start up pump should have psi.

one thing about psi washers is that you should not let them run with out pulling the trigger it will ruin the pump. we have destroyed about three of them before i got smart and got a car wash handle that lets the water flow always.

what happens to the pump is the water gets too hot and burns up the seals in the pump then the pump has to be rebuilt. i know of a couple of places in marietta that can fix it but nothing in conyers.