I had that problem with my 3 inch dry land nozzle as well. After numerous attempts and changing the elevation of my highbanker many times, nothing was changing. I did some research an read that my pump I was using (2") did not put out enough pressure (psi) to work right. When I looked for a new pump I found a 2" pump that was high pressure discharge. It has duel discharge perpelars and puts out 119 psi at 3/4 throtle. It was considerably more expensive, but I only had to run it at half throttle for everything to work correctly. My smaller pump was great for running my my highbanker by itself because that requires more water volume then water pressure, but with a dry land nozzle it's more water pressure then volume. And with useing a bigger pump at only half throttle, I was using less gas and bigger tank so I can get a full 8 hour run on one tank of gas. Hope this helps. Hope for good clean outs and heave pans!