As long as you are using the pressure wand the engine runs fine as soon as pressure builds (stop spraying) engine stalls
Frank, either the unloader valve is out of adjustment(try loosening it off) or it is faulty and needs rebuilt or replaced as most people do.
Check the attached vids,instruction and guides, Good luck
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The pump has an unloader valve it has a check valve at the high pressure output port where you connect your hose and trigger gun remove the fitting inspect check valve it may be stuck open
SOURCE: engine reves up & down under pressure
Sounds like the bypass valve is sticking. You need to locate it and grease it with a good waterproof grease
SOURCE: STARTS AND RUNS FINE BUT WHEN I START WASHING IT
The reason it stops spraying might be a clogged gun, hose or nozzle-tip.
The reason for pressure buildup killing the engine might be a stuck unloader valve in the pump.
While you are checking each component of the "output" side, spray some penetrating lube into the "input" side of the pump (where the garden hose connects) and let it be working on the unloader valve.
Fix the spraying problem first:
Start at the nozzle and verify that it is open by using low-pressure air. Clean or replace as needed. Next check the hose (with nozzle and gun unhooked) and finally the gun/trigger mechanism.
All must be clear and open to perform correctly.
Next, pour a few ounces of power steering fluid (or similarly LIGHT oil) into the garden hose, attach it to the pump and turn on the water supply.
Leave the "output" hose, gun, etc. UNHOOKED and point the output port of the pump (where the high-pressure hose connects) towards a vacant, safe area.
Startup the engine and allow the oil in the garden hose to work its way thru. (About 1 -3 minutes of run-time.) Shut it down and attach the high-pressure hose.
Hope this solves the problem!
SOURCE: engine on pressure wash stops.
Remove float bowl and check fuel flows freely from the float shutoff valve.
If this is the case, you don't whave to worry about a blocked fuel filter (Which might be in the tank)
Check for any loose electrical connections.
Try a new plug as the insulation of the plug may be breaking down when it gets got (There could be hairline cracks in the ceramic)
SOURCE: engine starts up on honda 2500 pressure washer water comes out wand but will not get up to pressure
Have you checked the hydraulic fluid level in pump?
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