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Never owned one of these before. It's a gravity fed 5 Gal pressure sandblaster from Powerfist. On sale at princess auto for $90. I have it hooked up to a CH compressor rated for 8CFM @ 125PSI

I can't get it to 'spray'. It is puking sand out the gun without any force and sputters to full power without ever getting there for more than a few seconds. Any thoughts? I am probably just setting a valve wrong somewhere.

There are 3 valves on the tank. One lets pressure in the top of the sand compartment, one lets air into a bypass hose that leads to the gun, the bypass hose goes to the bottom and out the gun. The 3rd valve lets sand into the bypass hose at the bottom. They are all open, although I think I tried it every which way just to be sure I wasn't doing something retarded.
 
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