well today was a nice day with warm weather and no rain so i took some time to take care of doing some spring yard cleaning starting with picking up some sticks and misc. stuff that had fallen over winter. then i decided to get out the pressure washer and clean off the sidewalks from the mud that was on them from all the rain we have had lately i got about halfway finished and my pressure washer stalled. i knew it wasn't out of gas since i just filled it up and had only used it for 15 minutes so i got it restarted and attempted to finish the task at hand. well it fired right back up but everytime i pulled the trigger on the gun it would stall, finally after the third time of starting it back up it would stay running but not spray any water under pressure. i did some basic stuff to eliminate the high pressure hose and gun as the problem by removing them from the pump and starting it up what happened was that with the engine not running it would spray water out of the outlet but once it was running it wont put any water out. so i shut it back off and the water would spray out with a bunch of air bubbles so i think that there may be an internal check valve that is either stuck or bad and its trying to push the pressurized water back into the house plumbing. now to just figure out what valve it is inside the pump and see if it cn be repaired or if i'll have to save up for a new pump.