Water continues to spray out the back of pressure washer when running

Tune up motor, replace air filter/spark plug and oil.

Does this behavior change if the engine is warm and on minimum choke? Do you get any water spray before the engine quits? Carburetor could be dirty or float stuck. Try putting dose of carburetor cleaner through engine and cycle choke lever and engine speed lever back and forth while engine is running after it has warmed up without running water spray. See owners manual.

Check the hose and nozzle to see if it has any debris in it.

Does the electric motor keep running? If it does continue to run with the trigger in the spraying position, then your pressure switch and motor are OK. If the motor is running and the water is not coming out with pressure, then either your check valves are not closing properly or the pumping mechanism is in need of repair. I think those little electrics have a simple wobble plate design. Basically not worth the effort to fix them

According to epowerwash.com:
"The unloader valve diverts water flow into bypass when the trigger gun valve is closed. Unloaders may be designed to respond to either an increase in pressure or a change in flow. The unloader valve may also be used for variable pressure adjustment."

More information here:
All About Unloader Valves ePowerWash

Okay!

just follow the power cord and unplug the damn socket from the electrical outlet!

If you are using a water tank for water supply, remove the water supply line from the pressure washer and connect a water hose from a faucet. Turn the water on, then crank the engine. Pull the trigger of the spray gun until water comes out. When then water starts to spray properly the release the trigger, shut engine down with pressure on the line then reconnect the water supply from the tank to the pressure washer. If this fixes the problem then the problem was "air-locked"! Happens alot with new pressure washers that have never been run. If you need any other help, please email me @ [email protected]

try taking off water hose an in that water in let spray wd 40 while it is running thats the best advice i can give you do it for like 2 minutes

your not missing anything, check the pump, they tend to go bad over time and may need replacing. The pump provides the pressure as well as the suction for the whole process, pulling water from the hose or tank and pushing it forcefully through the pressure washer line. If the motor is running and you have the water going through the line and to the pump, and no water is coming out, my guess would be the pump.

Most pressure washers spray unheated water which is fine for most applications. However if you need to remove very heavy grease then you may need to have to opt for a Hot Water Pressure Washer, utilizing either a propane or diesel burner. The downside is that you should expect to pay a lot more for these. Also, the heater is an additional part that requires maintenance and care. Do not run heated water through cold water systems, since this can damage the pump O-rings and gaskets.