Pulling the trigger or releasing it will make a sudden change to the load on the engine.
If the engine cuts due to a sudden load change it might be the governor isn't responding quickly enough or more likely the carb is either partially blocked or maladjusted, though there is the possibility the spark might be weak or the spark plug worn.
SOURCE: No pressure in the pressure washer
Leaving the hose on shouldn't cause a problem so don't panic. It sounds like you could just have a dirty nozzle. Try sticking a pin or something in the end of the nozzle (machine not running) and giving it a clear out. also if it is a two peice gun, split it and tap the squirting part on something clean like a workbench to clear any debris that might have got in there.
SOURCE: honda pressure washer cuts out when lance trigger released.
You most likely need to set your valve clearances. If it is hard to
pull over or the recoil snaps back after starting your valves need to
be set for sure. This may not be the entire problem but it is a good
start. Also change the spark plug, a bad plug will cause odd problems
and is too cheap not to eliminate as a source. In addition check your
fuel, pour a little out into a white container (I like spray paint can
caps for this) and look at the color. If it is yellow to orange it is
bad. You can pour it into you car, the car electronic sensors will
compinsate for it quality but a small engine can't. Use a NGK BP6ES or
BPR6ES plug.
You need:
Feeler gages
10mm open end wrench
14mm open end wrench
1 long shaft screw driver or rod
1 spark plug socket and ratchet
Remove
the spark plug and the valve cover. Pull the recoil over slowly until
the intake valve opens (intake is closes to the carb and it will go
down when it opens). Now put your long screwdrive down the spark plug
hole. Slow pull the engine over until the screwdriver handle is at it
highest point, this is top dead center. It may take a few attempts. Now
check your valve clearance between the rockers and the top of the
valve. The intake should be .006 and the exhaust .008, both can be +/-
.001. To adjust: hold the large nut with the 14mm then loosen the small
one with the 10mm. Lefty loosey. Now turn your large nut until you get
the correct setting and then tighten the small one the lock it in. It
may take a few attempts and alway reverify your setting after you lock
it down. Once done, find top dead center again and reverify. Now your
valves are set.
SOURCE: pressure washer stalls out when wand nozzle is released
common for not starting unless trigger engaged as you are turning the pump as well as engine creating pressure,as for stalling pump has unloader valve which is probably in need of grease(use good silicone grease)this allows water to ciculate when trigger released.
SOURCE: 2-yr old troy-bilt pressure washer with honda
It sounds like an air lock. Try this: With the machine off, connect the hose to the washer and let it run for several minutes to get all of the air out of the hose, and to purge any air out of the pump. Shut off the water, and connect the high pressure hose, but not the gun. Let the water run for several minutes. stretch out the HP hose and make sure that the air is displaced. Shut off the water, connect the gun, and purge as before. Now crank it washer up. As quickly as safe to do so, open the trigger to keep water moving through the washer. It should come up on pressure very quickly. It is better during normal operation to keep water moving through the system. When I am through for a while, I shut down my washer, but leave the trigger depressed to allow the pump to stay full of water, and cool. This prevents further problems when I restart it.
Hope this was useful.
Regards --W/D--
SOURCE: We have a Karcher G2500VH pressure washer. If you
Hi, Karcher calls the unloader valve a spill valve,
this is a link to a full drawing/parts listing , and your fault description might well be a sticking /seized unloader(spill ) valve hope this helps
http://www.pressureparts.com/ManualViewPage.aspx?Manual=/mmDEV/PDF/karcherparts/g2500vh.pdf
the part number is on page 9 of the drawing
spill valve 45910400
hope this helps , we usually use some good quality silicone grease to lube the valve ,
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