Pressure washer cuts off when I let go of trigger!

Hey guys my pressure washer just shuts off when I let go of trigger after a few seconds, I'm thinking of unloader problem cause water is spraying everywhere out of unloader? Thanks
 
The unloader isn't unloading. It is over-pressurizing the system and killing the engine.
 
If the pressure can't bypass the pump eventually stops dead in its tracks and can smoke belts or kills the engine and all kinds off crappy stuff, I have even seen it ruin the pump, replace the unloader, replace the pop off valve as well cause its apparantly not functioning correctly, or it has been removed!
 
Thanks guys, yeah I shut it down after it happened and used the backup on trailer, getting it taken care of today, thanks
 
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