Washer has low pressure. but can see pressure build up in hose. then when squeez triger motor stops.

POSSIBLE this look picture hose coupling with water stop put on the tap side or lime in valves after long time or a nozzle with dirt close beaten
clogged nozzle on the lance

Bypass not working (lyme)
if you disconnect the lance and the handle grip is giving enough water and water comes out then the nozzle clean it with a little paperclip.

1. Hi try descaling the lance as they very easily furr up with lime scale then drain after use every time. Good luck

It sounds like the nozzle is worn or the wrong size ( too big )

Things to check:
1) is water coming out of the bottom of the pump or is the oil in the crankcase high level and milky yellow. If so your seals are bad.

2) Your check valves might not be seating properly. A couple of fouled check vavles will cause either no pressure or pulsing pressure. A good inlet water strainer keeps foreign matter out of valves. But valves do wear out and get build up that keeps them from working right.

3) Your unloader valve might be worn or fouled. Bad unloader would usually show as low pressure ( but more than hose pressure) or low volume out the trigger nozzle.

Valves are your most likely problem.

Same problem here. Machine still looks brand new. Absolutely no nicks in the hose. Electric power is just fine. I hear the motor, then when I squeeze the trigger, I get a weak dribble of water for about 5 seconds, then the motor is quiet for a while. This sound familiar to you? I just posted my similar problem. If you hear anything useful, please forward it to me : [email protected] Ron

Trying to start a pressure washer with water supply on and gun trigger off will be a difficult task. It could be comparred to trying to start a lawn mower with the mower in tall grass. Place the mower on the drive or walkway and pulling the rope to start the engine is much easier. It is easy to start your pressure washer with no water in the system however there is a remote possibility that you could overheat the seals if you take too long to turn on the water. It is a little more difficult to start the washer with water supply on and someone holding the trigger to wand open. This will prevents pressure from building and making engine hard to start. You will not damage your washer if you start it with water supply off if you flood the pump and pressure hose with water first . Here is the procedure I use if i am working alone. I trun on the water to pump and open trigger to gun to allow water to flow into pump and pressure hose. Turn off water (leaving the water supply on will make it a little harder to pull starter). Start engine while holding trigger to gun open. When engine starts release gun causing unloader to activate circulating water in pump. Now turn on water and you are ready to work. If your system is under warranty however, I would advise to use the starting procedure outlined by mfg (hold open trigger to gun however). To get the longest life from unit try using it at say 75% of capacity or lower if your can and use max pressure on the tuffest jobs. Leaving your washer at full pressure for all jobs is like driving your car at 100 mph everywhere your go. Good luck.

the triger has a small ball bearing and a spring in it,,,strip out the triger
dont loose the bits and clean then grease it using water proof grease so its free to slide then the jobs a good un? get yourself a drink and go back to power washing ,,but this time it stops when you tell it to?

When I use my machine I hook up the water to the pump, hook up the high pressure line and gun, then turn on the water full and squeeze the triger to make sure all air is out before starting the pressure washer(mine is gasoline powered). Then I install the nozel on the spray gun. If you are having surgeing water pressure Check the hose washer where the water hose hooks to the machine, and be sure the supply hose is not restricted and valve is on full.
If this was helpful please leave Feedback. Thanks, SP

the problem may be the oil. if the oil is fine then try crimping your hose to let less water pressure through. if that still does not work lowes or home depot will fix the problem cheap. thank you for using fixya

Yes, There is a blockage either behind the spray tip or inside the trigger of the pull trigger.You should be able to service both parts.