Pressure washer builds pressure for a second then loses it

Reply

  #1  
Old 03-27-17, 06:45 PM
S
Member
Thread Starter
Join Date: Jun 2007
Location: Ludlow, MA
Posts: 172
Received 0 Votes on 0 Posts
Pressure washer builds pressure for a second then loses it

Hello, i have a Dewalt pressure washer. Ill have to get the model number later. I dont know the history but it starts and runs great. The water pressure only kicks in for about one second though, then goes away. It might possibly come back for one second. Sometimes not. I also noticed the engine dosnt idle up when pulling the trigger. Can anyone give me advice on where to start? I cant exactly find my issue searching google. Any help is appreciated!! Thank you!!!
 
  #2  
Old 03-27-17, 06:55 PM
M
Member
Join Date: Mar 2017
Posts: 10
Received 0 Votes on 0 Posts
If you can take the pump apart and clean it check and replace bad o-rings.
Sounds like a bad o-ring on what is called an unloader valve.
 
  #3  
Old 03-27-17, 07:02 PM
M
Member
Join Date: Mar 2017
Posts: 10
Received 0 Votes on 0 Posts
If you get it working use a pump conditioner when you put it away for any long length of time.
 
  #4  
Old 03-27-17, 07:28 PM
S
Member
Thread Starter
Join Date: Jun 2007
Location: Ludlow, MA
Posts: 172
Received 0 Votes on 0 Posts
This is what the pump looks like. Never saw one like this. Its pretty impressive to watch when running! Any advise on where to start?

http://media.easy2.com/flash_byo/dwl...0304093814.jpg
 
  #5  
Old 03-27-17, 08:18 PM
G
Member
Join Date: Jun 2006
Location: United States
Posts: 2,468
Received 11 Votes on 11 Posts
Somewhere on the pump there is something sticking out that doesn;t look like it belongs this is the un-loader, remove it and clean it, be careful about anything you must unscrew, count revolutions etc. after you have it cleaned and adjusted to the original settings you should be good to go. Have a good one Geo.
 
  #6  
Old 03-31-17, 02:58 PM
M
Member
Join Date: Mar 2017
Posts: 10
Received 0 Votes on 0 Posts
In your picture the gold unit with the hole in looks like the unloader valve.
You should be able to get a o-ring kit for it.
Check with your dealer about it settings.
 
  #7  
Old 04-06-17, 07:50 AM
S
Member
Thread Starter
Join Date: Jun 2007
Location: Ludlow, MA
Posts: 172
Received 0 Votes on 0 Posts
Thanks everyone. I pulled the valve out and got it moving and the pressure has come back! But the machine does not idle up when you pull the trigger. Resulting in low idle and lower then normal pressure. Is there a common cause for this?
 
  #8  
Old 04-06-17, 09:18 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 17,580
Received 50 Votes on 45 Posts
Possible stuck throttle shaft in the carburetor.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description: