Question about Delta Model DT2400CS Pressure Washer 5.5HP

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Pump will not unload.

Only starts when trigger is pulled and stalls when released.

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Hi if it stop when the trigger is pulled the issue is with the motor.
stopping is caused by , low revs on motor or low compression or poor spark, sometimes faulty carby.
change spark plug , adjust valve ( when valve has some slight side movment it is ok if up and down , it should be tighter (valves usually under side cover near top ) increase revs a little ( make sure revs dont get rough when running high) set max revs to when the engine still runs smoothly at max.

Posted on Mar 30, 2014

  • Douglas Barnes Mar 31, 2014

    I had this same problem. My "fix" was unbelievably simple. I did not know a pressure washer lube existed. I bought some of the lube at Lowe's and forced the lube through pressure washer. The lube freed the valve and we haved lived happily ever after. FWIW, it seemed obvious to ne the valve was stuck. It was.

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1 Answer

Craftsman 2200PSI pressure washer, part #580.752700 dies when trigger off.


NEVER start an engine on a power washer with pump attached. You will damage pump and get no or very little pressure. Replacing pump only fix. Pump for this washer about $49. Check spring on carb for throttle open/close

Jun 10, 2016 | Craftsman Garden

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Pressure Washer


any leaks from connection at pump to gun and wand assembly if so the valve is detecting leakage and open up again without u squeezing trigger it builds up in the head.if your trigger gun is leaking internally then you will need to replace the gun this unit uses a trap pressure unloader valve

Jul 15, 2013 | Garden

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Pressure washer starts fine and sprays fine but will not continue to idle after nozzle trigger is let go. Have to have trigger pulled to start & cannot let go without unit stopping.


The pressure unloader us usually the first part/s that fail. An unloader can fail resulting in no or very low pressure or good pressure, however will not unload when trigger is released and stall the motor. Look at breakdown for your pump and determine if unloader parts are available and reasonable. If too costly to replace these parts then install an ez start valve to help start engine and tie back wand handle to deal with unloader problem (workaround). Ez start valve can be seen here:
http://www.cmcpwe.com/accessorystartvalve.html

When not in use, store washer with oil in pump to displace the water. The oil will help lube internal parts and possibly cause the unloader to begin working (if stuck due to debris/rust). You can find a gizmo to help you feed oil into pump on ebay /other web locations. Good luck with your repair.

Apr 27, 2011 | Dewalt DPD3100 Gas Pressure Washer

1 Answer

When the trigger is off the motor stops and starts in quick succession until the trigger is pulled again


When the trigger is off your pump is overloading your engine this would be because the unloader is not doing its job try and change the pressure output of the pump this may unstick the unloader if not it may have to be taken apart.

Feb 04, 2011 | Karcher Garden

1 Answer

PWER WASHER RUNS PERFECT, WHEN WATER COMES ON, IT STALLS. BUT IF YOU PULL TRIGGER BACK ON WAND, THEN SPRAYER WORKS. THE MINUTE YOU LET GO OF TRIGGER, IT STALLS OUT.


hi you have got a fault with the unloader it's not unloading so its going a bove the 13amps and knocking the thermol overload out or blowing a fuse you could cable tie the trigger open or get a new unloader kit costing about £70.00 regards

Feb 17, 2010 | RTO 1800 PSI Pressure Washer

1 Answer

I just bought a 2nd hand honda excell psi max vr 2522 2.2 gpm max 5.5 hp gvc160. i put gas and oil and it wouldn't start?


Have a helper hold the trigger of the wand open while you try it again. If it starts that way you have a sticky unloader valve in the pump. DO NOT RELEASE the trigger for more than 10 seconds if the engine continues to strain when released! If the engine doesnt run freely when you let go of the trigger, pull it again and shut down the unit!
Add some power steering fluid to your supply hose (about 3 or 4 ounces at a time) and restart the unit with the trigger pulled. Allow the oil to flow through the pump for 1 - 2 minutes for each treatment. Several treatments should make the pump and valve happy again.

Hope this helps.

Sep 25, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

No pressure unless i take the nosle off , pull trigger and put nossel back on then it's ok until i release the trigger again ?


unloader valve sticking in the pump head. remove unloader valve/ pressure reducing valve as per parts manual.

It will probably be caked up in white crystal type deposits if its an aluminium pump head. clean off the deposits and inspect the 'o' rings. if 'o' rings ok , apply silicon grease and refit.

It could also be a partially blocked lance jet not allowing enough water to come out of the lance if it is a flow sensitive unloader valve.

Jul 11, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

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.

Apr 19, 2009 | Campbell Hausfeld Garden

1 Answer

Builds up to much pressure in hose and stalls engine


Sounds like the unloader is not working. try replacing it and see if that helps.

Mar 16, 2009 | Campbell Hausfeld PW2102 Gas Pressure...

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