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First you need to see if you have to utilize a soap nozzle normally black in color and with a large orifice that should create low pressure and or a selective change over nozzle with a spray pattern of 65 degrees.If so then you may have a clogged port where the chemical line connects to pump inside there is a check valve with a ball bearing that may be stuck from previous use without rinsing,free the ball by letting water flow with no trigger gun connected just water coming out of hose engine off and insert a nail or pin long enough to push the ball that is in the barb carefully til you hear ******* good luck.
usually when the power washer pressure stops the machine is running out of water. the sweep function uses a little more water than the round wash tip. Make sure there are no leaks in the supply hose and that the supply faucet is turned on all the way and has plenty of "flow". also make sure the water connection at the washer is not leaking. use a new rubber washer to make a good seal on the supply hose on both ends. if either end leaks or can **** air, just a little bit of air into the pressure washer will cause it to loose pressure.
The nozzle on the end of the spray wand has a very small hole in it that can be easily clogged by any sort of debris that comes through the water supply.If the nozzle can be removed, just take a pin & clear the hole from the outside & rinse it off. If the nozzle can't be removed, then take the wand apart at the connector in the middle and do the same thing.
Are you priming the water lines before you switch on the power? i.e. with power OFF, hook up hose and turn hose on (doesn't need to have much hose pressure), then take your spray gun or attachment and pull the trigger and allow water to flow through the system (at hose pressure obviously). You might need to gravity feed it if its not flowing through...
But you will generally only get pressure once all the air is removed from the lines and the pump is pushing water only... Once you have water flow and lines are primed, switch on pump and see if that solves it.