I was so happy to have finally purchased a pressure washer to blast the gunk out of my ducks' swimming pool. It was a used one at a price I could afford. The seller came to my house & showed me how to set it up, turn it on, and use it. It worked very well for him & for me. After he left I continued to use the washer and thoroughly cleaned the ducks' pool. There were no problems and I was very happy with my purchase. It's been a few weeks since that time, and I needed to clean the pool again. Only this time I had trouble getting the pressure washer to work. The motor is working fine, I think, putt-putting away and not sounding strained. But I couldn't get the water to blast out of the nozzle every time I pulled the trigger. It was working for a while, then there would be times when I pulled the trigger & got nothing, not even a drizzle. I kept trying different things, making sure the hoses weren't kinked or anything. Then there would be a short period when it would work again, and then again nothing. It seems to me that there is something clogging a line somewhere. During the times it didn't work the trigger was loose, and the hose didn't feel as full. But where do I start to trouble shoot this? And how? Or is this something an amatuer should even attempt by themself?