Pressure washer getting no pressure
Ok so here's a little background. I traded a guy a 212cc horizontal engine for a pressure washer and a nice iPod dock station w/ wireless speakers. I tried out the engine before I took it, but didn't take the thing apart in front of him. We met in a parking lot so I wasn't able to test out the washer with water. I got home and found out I needed some parts for the washer. I invested about $50 in ordering new little parts to fix it, only to find it still doesn't work. The problem is that I screw in the hose, pull the trigger and water shoots out. I turn the engine on, squeeze the trigger and the water shoots out with the exact same amount of pressure. Literally no difference. Now I ran the washer with no water (I know its bad for the pump) and shouldn't there at least be air spraying out of the port the pressure hose screws into if there's no water? I've inspected everything on the pump and I've never taken a pressure washer apart before but I spent some time learning how it works and it SEEMS as though it should work just fine. I'm just not sure what's going wrong and why it's not working. With the hose attached and the engine on, there aren't any leaks. The pump does rotate and pushes the pistons up and down as the engine spins.
I'm hoping there are some experts out there who can look at the attached pictures and tell me what I'm missing or how I can fix this.