Question about Dewalt 3800 PSI Pressure Washer

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Dewalt 3800 psi

This is the second 3800 dewalt in 2wks I have made sure its getting at least 5gpm by timing 5gal bucket fill over 5gallons in under 40seconds and made sure pump was full before startup it worked great for about 1 hr then it did the same as the last one when trigger is pulled it had a 30 to 45 second Delay now its longer could this be a bad run on pumps BTW it has a AAA pump not a cat thanks Joe.

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  • joe Altman May 06, 2013

    Brad Brown thanks I am using no chemicals whatsoever i know I'mgetting over 5gpms at the input hose was told by someone that works on P/washers that it is the unloader valve I tried adjustment but nothing works so its going back to HD tomorrow for a new one thanks

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  • 5 Answers

It's the gas cap. The cap won't vent and it causes a vacuum in the tank and won't let fuel get to the carb. Crack the gas cap open enough to let some air in and run it like that. If it solves your problems then you can get a new cap cheep. I had the same problem with mine.

Posted on Jan 22, 2015

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  • Dewalt Master
  • 15,557 Answers

You checked the output to measure 5 GPM? How are you feeding that unit? What are you using for detergent? Have you adjusted the bypass valve?

Posted on May 06, 2013

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6ya6ya
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Posted on Jan 02, 2017

puertobori
  • 7733 Answers

SOURCE: Dewalt 3800 PSI operates great

When you pull to start squeeze the water hose tigger until start.

Posted on Oct 03, 2010

harlan301
  • 205 Answers

SOURCE: I have purchased a Dewalt 3800 PSi cold water

check to see how hot the water can be, ti should be on the unit or in your book. also your amps should be no less than 15amp, long core can over heat the motor. if your unit can't handle hot water it will melt the valves

Posted on Oct 12, 2009

  • 243 Answers

SOURCE: low pressure

hi some valves at cat pumps need a 100 psi pressure to open and close correct. when there is air in the pump the valves wil not open and close till air is bleeded. take of highpressure hose, open watertap and bleed pump till no more air comes out. reconnect all hoses and try again. if there is no more air in the pump and its still not working, i should think its the pump.

Posted on Feb 16, 2010

  • 1383 Answers

SOURCE: if the pump is broken, should the engine start?

If the engine turns rather freely and not hindered by malfunction of pump, then it should start. Since you are going to rebuild pump, you should just remove the pump from the engine now and set it on the work bench to prevent any further damage. It is a good idea to test engine before you spend any money on the pump. Dewalt service center has all the parts lists for your machine, however you should look up the model number of the pump itself (stamped / tagged on body of pump) and look for more information from mfg. web site. Good luci

Posted on Nov 11, 2010

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1 Answer

The engine runs but the water will not come out under pressure


You must have blown out the cones (thats how the water gets compressed inside of pump) in the water pump-

You could try this though on the back of the washer right on top of the water pump is a black knob about the size of your hand that knob will adjust the pressure try turning it and see although I doubt that is the problem-

A pressure washer is not like a compressor you HAVE to pull the trigger every minute NEVER let it just sit there running without pulling the trigger to release the pressure that Dewalt 3800 psi washer you have is a great machine in fact we own 4 of them and they are pretty powerful and easy to damage if left running alone.

TY,

Perry Tradesman

Sep 05, 2014 | Dewalt 3800 PSI Pressure Washer

1 Answer

What type of oil do i use in a dewalt 3800 pressure washer


in the enginge you can use a standard 4 stoke engine oil.
in the pump you can use hydraulic oil

Dec 05, 2010 | Dewalt 3800 PSI Pressure Washer

1 Answer

If the pump is broken, should the engine start? if i choose to rebulid pump where do i find the torque values/guidlines for the pump. i have to get the model #, but i do have the dewalt 3800 psi model. ...


If the engine turns rather freely and not hindered by malfunction of pump, then it should start. Since you are going to rebuild pump, you should just remove the pump from the engine now and set it on the work bench to prevent any further damage. It is a good idea to test engine before you spend any money on the pump. Dewalt service center has all the parts lists for your machine, however you should look up the model number of the pump itself (stamped / tagged on body of pump) and look for more information from mfg. web site. Good luci

Nov 11, 2010 | Dewalt 3800 PSI Pressure Washer

1 Answer

DeWalt 3800 Pressure Washer Runs 20 min then quits.


I have the same problem and even have the issue with gas cap off.

Sep 24, 2009 | Dewalt 3800 PSI Pressure Washer

1 Answer

I have had two dewalt pressure washers in the last year. Both ended up having major oil leaks. I have read the instructions over and over and find nothing that I am doing wrong. Now on my 3750, dewalt is...


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?

Mar 24, 2009 | Dewalt 3800 PSI Pressure Washer

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