Question about Dewalt 3800 PSI Pressure Washer

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Dewalt Pressure washer keeps shutting off for no reason. plenty of gas and oil, water running to it. starts fine and as soon as I start spraying it shuts down.

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Had a similar issue with my dewalt 4200 pw. Unit starting shutting off after spraying for about 5 min. Then difficult to restart, but would start again eventually only to shut down a few min later. Had new engine oil, new pump oil, good gas. I changed the spark plug and unit runs great again!

Posted on Oct 15, 2017

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Posted on Jan 02, 2017

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SOURCE: I have a dewalt 3750

I worked at a tool rental center while attending college and learned many tips and tricks about Dewalt and other brand pressure sprayers. Your machine probably has a 13 hp honda and has max pressure of about 3500 to 3700 psi. Most of the problems that customers had were engine related due to severe working conditions including totally wet engine /plug, wet air filter, and or other problems that were easy to remedy. We would set the pressure regulator to minimum pressure and explained to the customer how to increase the pressure as necessary but only after the engine was completely warmed-up to running temp to prevent engine stall. Your machine has a throttle lever between the tank and carb that should be set to max if you are going to set pressure at or neer max range. Most cleaning jobs do not need much pressure. Use lowest pressure to get the job done. Your engine developes around 13hp at about 3600rpm. If you want to maximize the life of you sprayer, then use your machine at about 70% of capacity or about 2000 to 2500 range that will allow you to run your engine slower increasing lifespan. Your sprayer is likely rated at 4 gallons per minute so make sure that the tip is that capacity. The tip has the size stamped which would show the fan degree and flow in gpm. The wrong tip, say a 3.5 gpm will strain the engine to point of stop because the smaller tip increases pressure. Most engine stall is due to high pressure setting on new machines. Lower pressure when warming-up machine and use max pressure rarely when necessary to max life. Please email for other information/questions or simple tests to determine faulty parts, good luck.

Posted on Jan 30, 2009

  • 2 Answers

SOURCE: I have had two dewalt pressure washers in the last

First off are you taking it to a factory owned or an authorized service center? There is a big difference in the quality of service that you receive. A lot of times DeWALT gets a bad rap because of poor service from authorized service centers. IF you take it to a DeWALT owned center they have guaranteed repair cost and will take good care of you. Next question how old are these units? Where is the leak? How often are you using them-ie how many hours per day, week....Also the oil leak is it in the engine or pump? Neither of those are manufactured by DeWALT they buy the engine from Honda and the pump on yours should be a general-so how could that be DeWALTS fault?

Posted on Apr 07, 2009

  • 942 Answers

SOURCE: My DeWalt Gas Pressure Washer Model DPD3100 is

Hi

Just try the following steps

  • Inspect the water supply connections
  • Inspect the drain hose
  • Inspect the water pump
  • Inspect outer tub for cracks or corrosion
  • Inspect the tub seal
  • Inspect the tub bearing
Good luck

Regards

PCmania

Posted on Jul 05, 2009

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1 Answer

Dewalt DPD3800 pressure washer starts and runs fine. After 5-10 minutes of washing the engine quits. It will not start until it cools. The engine will start after a 10 minute cool down. It will run and...


I have the exact same pressure washer and have had the same issues with it. The cure for me was to simply run the washer with the gas cap loose. For some reason the fuel gets vacuume locked and stops flowing into the carb. The fuller the tank is it seems the shorter the time is between the time it starts and the time it shuts off. Or you might find a way to vent the cap. Hope this helps.

Jun 06, 2011 | Dewalt 3800 PSI Pressure Washer

1 Answer

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

Starts but does not keep running. checked oil & its full. do you need water pressure at the pump? I know it has a low oil pressure cut off.


First: check and change the spark plug and do a oil change (OIL IS NOT THE PROBLEM BUT IS GOOD TO DO IT) then do a test with fresh gasoline. Second:check all fuel components (LINES,CARB,ETC...) Third:if any of this fix the problem your machine need service.

Nov 10, 2010 | Dewalt DPD3100 Gas Pressure Washer

1 Answer

STARTS AND RUNS FINE BUT WHEN I START WASHING IT QUITS SPRAYING AND THEN BUILDS PRESSURE AND KILLS ENGINE


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!

Oct 05, 2009 | Honda Pressure Washer PSI 3000

1 Answer

My Simpson Water Shotgun shuts down about a minute into the wash


Have you checked the oil level? Some engines have a sensor that shuts it down if the oil is too low

Jul 16, 2009 | Simpson PS2600 PowerShot Commercial-Duty...

2 Answers

Power washer not starting what type of oil to use dpd3100


10 w 30 for engine

10 w 30 and specify for [PUMP OIL]

ANY AUTO STORE

THANKS AND PLEASE RATE JJ505

Apr 11, 2009 | Dewalt DPD3100 Gas Pressure Washer

1 Answer

Pressure washer wont idle and run


check the pressure replace valve or a bypass valve

Jun 05, 2008 | Karcher 2500 PSI Pressure Washer

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