Chris,

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!

Matt

I built a dry lander style nozzle and have played with it a little with a dredge sluice box. There definitely is a sweet spot, fully open it directs most of the flow out of the nozzle, find where it is cracked open enough to spray a little but still have enough suction to pull material to the high banker. In essence you are robbing suction power to wash the gravel so likely will have to be running full throttle with a high pressure pump. Highbankers may be a little difficult to feed correctly because of the lift involved. Propping the hose up along the length so there is not a steep vertical lift at the end or lowering the high banker as much as possible may help.