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Pull the trigger and water surges - Karcher 2500 PSI Pressure Washer

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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: water surges when you pull the trigger

If you have not flushed all air out of hoses prior to starting motor this may be the first symptom. If the water pressure from the spigot is competing with the clothes washer, shower etc. there may not be enough pressure to supply the demand of your pressure washer. A gauge attached to the spigot can give you a gallons per minute reading or take a five gallon bucket and time how long it takes to fill the bucket. ie: if the bucket fills in 2 minutes you have 2.5 gallons per minute. You may need this much to get un-interupted pressure for a 2400- or 2500 unit. Most residential properties are pipe sized from 3/4" pipe at the water main spigot at the front of the house down to a 1/2" pipe size at the rear of the house to maintain pressure.

Posted on Oct 20, 2012

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SOURCE: water surges when you pull the trigger

Not enough water feed would cause pump cavitation. It sounds awful.
It sounds like you either have an engine that is revving up and down which will cause the water to surge. This is most likely a dirty carburetor. You should notice a distinct increase and decrease of the engine noise.
Or you have one or more check valves that are not seating properly. In this case the engine noise will be pretty constant but the spray out the wand will pulsate.

Posted on Jun 01, 2015

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Hoover Spinvac F5915900. Trigger no longer causes a release of soapy water on floor. It doesn't have tension, fairly loose, but still in slots. How do I fix this problem?

The trigger that you pull to release water snaps into plastic pieces inside the handle where it pivots to push on the rod that goes down to push on the regulator that lets the water flow. If the trigger is pulled too hard it can break the plastic it pivots in. If this happens the rod doesn't push hard enough on the regulator to let the water flow. Remove the screw at the top of the handle to remove the handle part holding the trigger to see if this could be causing your problem.

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You need to give more information. Does the motor stall when you squeze the handle? Does the spray surge and the motor run well? Does the spray surge and the motor surge as well? Does water come out of the bottom of the pump? Does nothing come out of the spray gun when the trigger is squezed?
All of these symptoms point to different problems.
What does your machine do?

Oct 24, 2014 | Garden

1 Answer

Hi I have a homelight UT80546 pressure washer that stalls as soon as I turn the water on. I have replaced the pump with a brand new one that does the same thing. It also has a new carburetor, fyi

My neighbor has one that will do the same thing if the inlet water pressure it too high. I don't know if there is supposed to be a bypass for this water until the trigger is pulled or not. But once the trigger is pulled on the wand the problem goes away. So if you just pull the trigger when turning the water on that should solve your problem.

Oct 02, 2014 | Garden

1 Answer

Why does my pressure surge

Common problem across brands. When you spray water the drop in pressure triggers the motor to take the hose pressure ~ 30 psi and boost it to ~ 3000 psi. Water coats these parts with calcium (hard water) or other junk and water contains bacteria which causes slime and scale. Once that pressure switch / valve is sufficiently clogged it doesn't move smoothly so it can fluctuate between sending a yes / no signal about whether you are squeezing the trigger or not. This causes the pulsing.

EZ test: take the the tip off the wand, start the unit, squeeze trigger - should run continously with no problem. If it does for sure you need to watch a video on dissembling and cleaning the valve body. It is not hard but you must work carefully to avoid losing parts especially springs and take digital pictures to record the order for reassembly.

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Karcher K5.7 surging

Maybe the unloader valve needs to be adjusted. it controls pressure and if a unit is surging while on, I would look there.

Sep 08, 2017 | Garden

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I just bought a hoover steam vac model F5914900 and the clean water tank is leaking. I tried pressing the clean surge button and the trigger button that was suggested by someone else but it won't

Go to and find a local Service Station. They will replace it at no charge. MUST be a warranty location to get it free. Take your sales slip with you.

Jul 28, 2012 | Hoover SteamVac F5914-900 SpinScrub...

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I have used the McCulloch (FH180A) three times over the course of two years. On my fourth use the pressure washer just surged on and off and I would get a tiny spray from the gun each time it surged. In...

Sounds like the problem could be low input water flow or pressure. There could be crud on the intake where you hook up the garden hose, there could be some other sort of blockage. Try hooking it up to the hose and pull the trigger (with the power switched off) and wait to see if water comes out the tip. Also look at the tip(s) themselves. sometimes a piece of crud gets into the hose and then clogs the tip.

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1 Answer

Washer surges when trigger pulled

Check that your are getting proper water pressure. Also check filter going into the machine where the hose connects sounds like the washer is not getting enough water pressure.

Jan 06, 2011 | Karcher PSI Electric Pressure Washer

1 Answer

Hi i have inherited a karcher has only been used 4 or 5 times so i dont realy know how it should sound when. water is suplied to it it surges when you pull the trigger you only get the presure of...

hi there!
when you got as good as pipe pressure,you need to accelerate the speed motor to have a good pressurise water for your purpose,the pressure washer has a surge regulating valve as you trigger water gun the pressure blow up,as long
as you pull the trigger on the pressure build up pressure it has also equipt with pressure switch to regulate pressure and for safety can also adjust the nozzle by rotating gradually to slim the pressure water out put.have a nice day,don't forget to rate me.thank's

Apr 20, 2009 | Garden

1 Answer

When motor is at idle speed it surges

Try a simple test. It is ok to run the pump without water for a short time. Check idle speed without water in system to see if enginet surges. If it does not surge, then most likely the unloader/ pressure valve is causing the engine to surge when in the unloaded state. Life of unloader /pressure valve is shortened by letting system bypass for long periods of time. Enjoy

Nov 22, 2008 | Garden

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