I have an issue with my i5000 presoak application. The gantry moves toward the rear of the car and stops at the bottom of the arches and on the way back up the presoak stops around eye level. The tips still have air coming out but no presoak. The pump continues to run until the thermal overload kicks in. It does this every time. The odd thing is that when I engage the presoak using the output monitor it runs perfectly. I was able to get the presoak to work during the entire wash but I had to reduce the pressure to about 50 psi which is well below the normal 300. Any suggestions will be appreciated.