There is a pressure release valve in the pump. That pressure release valve is frozen shut (probably due to calcium or lime buildup). Other than disassembling the pump and clearing the calcium mechanically the only thing that I can think of is pouring CLR (Calcium, Lime, and Rust remover) into the port where the water hose connects and hope that the CLR will dissolve the calcium or lime. Pour as much CLR in as you can, connect the hose and pull the trigger and immediately release the trigger. You may have to pour CLR into the hose port several times.
SOURCE: on a generac pressure washer that works fine.
Oil level in pump and motor OK? Spark plug not fouled? Has it sat for a while - carb dirty? Running (loaded) throttle rpm not high enough?
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: I have a Briggs & Stratton gas power washer. This
Sounds like the unloader is not working correctly. Try replacing it and see what happens.
SOURCE: let go of wand trigger pressure will not come back
spill valve is stuck and needs to be cleaned and greased common problem....also check all connections for blockage in line
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