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Pressure washer builds pressure for a second then loses it


strider380's Avatar
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03-27-17, 05:45 PM   #1  
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!!!

 
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03-27-17, 05:55 PM   #2  
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.

 
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03-27-17, 06:02 PM   #3  
If you get it working use a pump conditioner when you put it away for any long length of time.

 
strider380's Avatar
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03-27-17, 06:28 PM   #4  
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

 
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03-27-17, 07:18 PM   #5  
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.

 
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03-31-17, 01:58 PM   #6  
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.

 
strider380's Avatar
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04-06-17, 06:50 AM   #7  
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?

 
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04-06-17, 08:18 PM   #8  
Possible stuck throttle shaft in the carburetor.


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