I was fooling with the darn thing today. I removed the deadman hose and was messing with the valves. I noticed if I took the ball valve off media would pour from it but if I put the valve back on in the open position the media would not pour from it. I did install a bigger 1/2 inch ball vave but it didn't do any help.
I noticed too that when I opened the sand and air valves the pressure gauge on the blaster would rapidly drop to zero.
Maybe my hoses are too small? I have it set at 70 psi. The compressor does turn on and off but it seems like it can not fill the blaster tank with air quick enough for some reason.