Question about Briggs & Stratton Briggs Stratton 2550 Psigaspressure Washer

1 Answer

Won't pump water, stalls engine if trigger not squeezed

Had it stored for winter in garage, pulled it out yesterday to use and engine started for about 1 sec then quit and noticed it was harder to pull over, discovered if I squeeze the trigger to release water pressure the engine pulls over easily and starts but then stalls from the pressure build up and if I keep the trigger squeezed it will pressure wash for about 2 seconds then quits putting out any water from the wand and engine starts to bog down???

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  • seanyboy
    seanyboy Jan 26, 2018

    Your unloader valve is stuck. Hold the handle down as you were right to start with the handle squeezed. Once your choke is off, cycle that water to the unloader valve by squeezing the handle, letting go, squeeze and let go spurratically while engine is running. Sometimes it breaks that valve loose. Otherwise, replace your unloader valve

  • seanyboy
    seanyboy Mar 30, 2018

    Hey bro. Unloader for sure!



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May be it's ice-clogged?

Posted on Jan 26, 2018


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: low pressure from powerwasher wand when trigger


Posted on Nov 01, 2010

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SOURCE: My Briggs and Stratton Power

Ican see im going to have to wright this whole thing again . This sight is not good for people like me who know the answers . Something always pops up and loose my well thought massage . like the one i just wrote to you . Briggs olny makes the engine on your mechine you have 3 to 4 differant other companys that make all of the other parts this makes it diffelculy for anybody to get parts for the mechine . But there can olny be two things wrong with this mechine . The first is you have a problem with the valves on the pump body . Do you see brass caps on the valve body remove them one at a time . Check the valve you can remove them with a small pair of niddle noise pilliers look at the plastic cages around the valves they tend to break and jam the valve seats it olny takes one to cause this condution you describe . The other thing it could be is the unloader valve is stuck . This is the part under the pressure control knob and you will need to remove it . What it dose is allow the presserized water to recurlicate back through the pump body when the trigger is not open . This could also cause this condution . Most of the time it can be freed up with some WD40 and most are not servicable as a unit and lots of luck trying to find one .But the chances are good you can free it . In the winter time you should put antifreeze in the mechine disconnect the plug wire pull the cord until it comes out the other side this will protect it from the water freezeing and expanding and damageing parts aswell as corroition . Well good luck from what you descriped the valves but you should also turn that pressure knob in and out on a regular baicis to keep it free

Posted on Jun 08, 2011

  • 43501 Answers

SOURCE: My Briggs and Stratton Power

I think that you are right on with your assessment of the problem...something has come apart inside the wand and it is blocking the water flow under high pressure or it will not open under high pressure...I would replace the wand.


Posted on Jun 10, 2011

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What I've always done is just disconnect the water hose then start the washer and pull the trigger till no more water comes out. You don't want to run it very long at all after there's no more water though, you can quickly overheat the pump if it is ran without a water supply for too long. I've been doing this for the past 3 years with one of my washers and haven't had any problems with the pump.

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