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Check the fuel pressure regulator. It is on the drivers side, front of the engine near the throttle body. Remove the vacuum hose and see if fuel comes out of the nipple. If it does than the regulator needs to be replaced.
If the regulator is fine than you will need to check fuel pressure with a gauge. If fuel pressure drops as soon as you shut off the car than the fuel pump is likely bad.
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 @ firstname.lastname@example.org
Take hose and gun off pump. Start engine. See if pressure comes out of pump. Next, remove water hose and look at filter washer. Clean or replace filter washer. Turn on water and it should come out of pump on other side. These steps will tell you if problem is water supply or pump.
Sometimes the problems happen because the gun lever is bad. Hook up hose but not the gun See if pressure comes out hous. These steps will tell you if problem is gun or hose.
Make sure thre is no air lock in the system line. So first of all use a clean line to wash off and blow out any dirt in the spray gun.
make sure the engine is having good fuel and power it on to run and warm up . let it run over without any load on it . Now turn the hose on it and power it on slowing, do not stop but keep it running to power spray . The accumulated dirt might come off and make the run smooth after some time.
you may have a broken or sheared pin. That being said I am stepping out of my comfort zone because I do not know that exact model but I have seen it happen to others.
Any small engine shop should be able to repair it for a reasonable price.
you will have to try the following start up purge up onece with just water then start the powerwasher if that does'nt give u pressure ther is gaskets inside the pumping sometimes 4 to 8 of them these might be to wore down to hold pressure if u can locate the pump and desemable it run it to ur local dealer tell u need new gaskets put into it